Climate 411

How Do We Know That Humans Are Causing Climate Change? These Nine Lines of Evidence

While most Americans acknowledge that climate change is happening, some are still unsure about the causes.

They are often labeled “climate skeptics,” but that label can cause confusion or even anger.

Isn’t the nature of science to be skeptical? Isn’t it good to question everything?

Yes, but —

Here’s what is getting lost in the conversation:

Scientists have been asking these questions for nearly 200 years. The scientific community has been studying these questions for so long that collectively they have amassed an overwhelming amount of evidence pointing to a clear conclusion.

A similar situation is smoking and cancer. Nowadays, no one questions the link between smoking and cancer, because the science was settled in the 1960s after more than 50 years of research. The questions have been asked and answered with indisputable evidence.

We can think of the state of human activities and climate change as no different than smoking and cancer. In fact, we are statistically more confident that humans cause climate change than that smoking causes cancer.

Our confidence comes from the culmination of over a century of research by tens of thousands of scientists at hundreds of institutions in more than a hundred nations.

So what is the evidence?

The research falls into nine independently-studied but physically-related lines of evidence, that build to the overall clear conclusion that humans are the main cause of climate change:

  1. Simple chemistry that when we burn carbon-based materials, carbon dioxide (CO2) is emitted (research beginning in 1900s)
  2. Basic accounting of what we burn, and therefore how much CO2 we emit (data collection beginning in 1970s)
  3. Measuring CO2 in the atmosphere and trapped in ice to find that it is indeed increasing and that the levels are higher than anything we’ve seen in hundreds of thousands of years  (measurements beginning in 1950s)
  4. Chemical analysis of the atmospheric CO2 that reveals the increase is coming from burning fossil fuels (research beginning in 1950s)
  5. Basic physics that shows us that CO2 absorbs heat (research beginning in 1820s)
  6. Monitoring climate conditions to find that recent warming of the Earth is correlated to and follows rising CO2 emissions (research beginning in 1930s)
  7. Ruling out natural factors that can influence climate like the Sun and ocean cycles (research beginning in 1830s)
  8. Employing computer models to run experiments of natural vs. human-influenced “simulated Earths” (research beginning in 1960s)
  9. Consensus among scientists that consider all previous lines of evidence and make their own conclusions (polling beginning in 1990s)

(You can also see these nine lines of evidence illustrated in the graphic below)

Skeptics sometimes point to the last two supporting lines of evidence as weaknesses. They’re not. But even if you choose to doubt them, it is really the first seven that, combined, point to human activities as the only explanation of rising global temperatures since the Industrial Revolution, and the subsequent climate changes (such as ice melt and sea level rise) that have occurred due to this global warming.

The science is settled, and the sooner we accept this, the sooner we can work together towards addressing the problems caused by climate change – and towards a better future for us all.

 

(Click here for a pdf version of the graphic)

 

Posted in Basic Science of Global Warming, Greenhouse Gas Emissions, Science, Setting the Facts Straight / Read 39 Responses

Trump Moves to Cook the Books, Undercutting Common Sense Climate Protections

This blog was co-authored with Martha Roberts

It’s reported that the Trump Administration is poised to continue its barrage of attacks on some of our most vital health and environmental protections, following last week’s assault on broadly supported fuel economy and greenhouse gas safeguards for cars and light trucks. Here’s one attack that they may try to sneak under the radar—a move that would undercut common sense climate protection all across the federal government: directing federal agencies to abandon the use of social cost of carbon estimates in their evaluation of new policy.

The social cost of carbon is a measure of the economic harm from the impacts of climate change. Specifically, it’s the dollar value of the total damages from emitting one ton of carbon dioxide into the atmosphere. Weakening or eliminating the use of the social cost of carbon would result in skewed and biased policy-making that ignores the benefits of crucial safeguards and stacks the deck against actions to protect communities from the mounting costs of climate change.

The devastating impacts of climate change on health and the environment – such as extreme weather events, the spread of disease, sea level rise, and increased food insecurity – can cost American businesses, families, governments and taxpayers hundreds of billions of dollars through rising health care costs, destruction of property, increased food prices, and more. Many of these impacts are already being felt by communities across the country, as the government’s leading scientific agencies have found.

When the federal government develops policy affecting the carbon pollution causing climate change, it is both reasonable and essential that it takes these costs into account. The social cost of carbon is a tool that allows policy-makers to do just that.

Currently, the federal government uses a social cost of carbon estimate—roughly $40 per ton of carbon pollution—that was developed through a transparent and rigorous interagency process, relied on the latest peer-reviewed science and economics available, and allowed for repeated public comment as well as input from the National Academy of Sciences.

But that may not last much longer. As we’ve seen, the Trump Administration is waging war against an array of our most crucial health and environmental protections, ignoring the urgent threat of climate change while prioritizing fossil fuel interests. President Trump’s new Administrator of the Environmental Protection Agency, Scott Pruitt, denies that carbon pollution is a primary contributor to climate change, and built his political career by suing EPA 14 times as Oklahoma Attorney General to block protections from mercury, arsenic and smog pollution, hand in hand with the worst elements of the fossil fuel industry. Meanwhile the Administration is proposing devastating cuts to the budgets for EPA and climate research, and is moving towards revoking the Clean Power Plan, America’s first-ever nationwide limits on carbon pollution from power plants.

All of this points to a clear disregard for basic science, economic principles, and our nation’s clean air laws. Eliminating or weakening the social cost of carbon is another pernicious tactic by the Administration to undermine the development of crucial climate safeguards – by erroneously making it appear as though reducing carbon pollution has little or no benefit to society and the economy. Even the current figure is very likely a conservative lower bound since it does not yet include all of the widely recognized and accepted impacts of climate change.

The details of the upcoming attack are still unclear. It’s possible that the Administration may end use of the uniform social cost of carbon estimate at the federal level—despite its rigorous basis and judicial precedent. Other indications suggest that the Administration may choose to artificially and arbitrarily discount the costs of climate change for the health and economic well-being of our kids, grandkids, and future generations—ignoring the growing consensus among economists that supports valuing these impacts more, as does a recent report from the Council of Economic Advisors. Or the Administration may decide to disregard the fact that our greenhouse gas pollution has harmful impacts outside U.S. borders that can have costly repercussions for Americans.

Throwing out the social cost of carbon may play well with President Trump’s supporters in the fossil fuel industry. But the importance and appropriateness of accounting for these costs is a matter of both economics and law. We also know that nearly two thirds of Americans are concerned about climate change. Undermining limits on pollution—protections that are rooted in rigorous scientific research, reflecting long-standing bipartisan economic principles—will ultimately harm the health and environmental safety of all Americans, including Trump’s supporters.

This post originally appeared on EDF’s Market Forces blog.

Posted in Economics, Greenhouse Gas Emissions / Comments are closed

Four Important EPA Programs Threatened by President Trump’s “Skinny Budget”

Wikimedia Commons

The Environmental Protection Agency’s (EPA) critical mission to protect health and the environment is strongly supported by the public, which is why it is incredibly alarming to see that President’s Trump’s new “skinny budget” would cut EPA’s funding by 31 percent.

Half of EPA’s budget goes to states, tribes, local agencies, and non-profits, which help carry out EPA’s lifesaving mission and provide significant benefits to communities in the process. EPA also provides essential technical guidance, assistance, scientific research, coordination, and more to help states and others protect health and the environment. Budget cuts to EPA would jeopardize Americans’ health and the safety of their communities.

In addition to the vital programs that protect our air and water, these are a few examples of programs that EPA oversees – and that are now at risk.

Cleaning Up Pollution from School Buses

School buses take 25 million American children to and from school every day. Many of these buses are old and their exhaust includes harmful pollutants like nitrogen oxides, particulate matter, and toxics.

Children are particularly vulnerable to pollution given their faster breathing rates and developing respiratory systems. Exposure to this pollution can aggravate asthma and cause other health problems.

Newer diesel engines are 90 percent cleaner than the old ones, however. So EPA administers a program for school districts to help them fix the problem. School districts can apply for rebates to replace or retrofit older buses under the Diesel Emissions Reduction Act (DERA) – a broadly bi-partisan program enacted by Congress. More than 500 school districts applied for this program in 2016 and 88 school bus fleets from 27 states were selected. More than 400 older diesel buses will be retrofitted or replaced thanks to DERA.

The 2016 grant recipients include:

  • Marana Unified School District #6 in Arizona, which received $465,000 to replace or retrofit 20 buses
  • Three school districts in Michigan (Haslett, Hudsonville, and Whittemore) that received $180,000 for nine buses
  • Three school districts in Pennsylvania (Carlisle, Glenmoore, and Philadelphia) that received $305,000 for 17 buses

The school bus program provides essential funding to school districts that need it. And we know that cleaning up buses is working – a recent study found that children in schools that had adopted cleaner fuels and technology were absent less and had improved lung function. Experts estimate that there are 250,000 older, dirtier school buses still in operation, indicating that we – and EPA – have much more work to do to protect children’s health.

(The school bus program is just one part of the DERA program to reduce diesel emissions. Find total DERA allocations to all states, from 2012-2016, here.)

Chesapeake Bay Program

The Chesapeake Bay ecosystem provides more than $100 billion in economic benefits each year to the region’s 18 million residents, yet has for years been threatened by air and water pollution.

The Chesapeake Bay Program, created in 1983, is a partnership of six states (Delaware, Maryland, New York, Pennsylvania, Virginia and West Virginia), the District of Columbia, the federal government, and numerous local governments and NGOs dedicated to restoring this iconic feature of the Mid-Atlantic.

EPA plays a vital coordination and technical advisory role for the Chesapeake Bay Program, setting goals and assisting local jurisdictions’ efforts to meet them. About two-thirds of the $70 million or so EPA dedicates to the Chesapeake Bay Program flows to state and local governments as grants.

Successful — yet ongoing — cleanup efforts include:

  • Between 1985 and 2015, the Chesapeake Bay Program has reduced harmful nitrogen water pollution by 30 percent, phosphorus by 40 percent, and sediment by 25 percent.
  • The outlook for fish and blue crab habitats, as well as key wetlands and underwater grasses, is also improving.
  • A new agreement signed in 2014 launched a more robust, accelerated restoration pathway that is still being implemented and just starting to show signs of progress.

Budget cuts to the Chesapeake Bay Program would jeopardize these encouraging trends.

Cleaning up Brownfields and Toxic Sites

Brownfields – properties contaminated by a hazardous substance – present a significant challenge to communities.

There are almost half a million Brownfields sites across the country. EPA provides technical assistance and administers several grant programs for states, local governments, and tribes to clean these sites up, conduct assessments, do job training, develop plans for use of the properties, and more.

These projects not only protect a community’s health and citizens, they also provide valuable economic and societal benefits by bolstering redevelopment efforts in existing communities —turning abandoned properties and eyesores into engines for job creation and economic growth.

In fiscal year 2016, projects created $16.11 per EPA dollar expended. Brownfields projects have overall created more than 117,000 jobs nationwide and have been found to increase residential property values near a Brownfields site by as much as 15.2 percent when a cleanup is completed.

A few projects funded or completed include:

  • $600,000 awarded for cleanup of a former tannery in Berwick, Maine. The vacant property was used for 100 years for leather tanning, woolen milling, and shoe and carriage manufacturing. Contaminants include VOCs, PAHs, and metals in soil and groundwater.
  • In Shelby, Montana, a largely abandoned historic school building was assessed for environmental issues, and asbestos and lead were cleaned up as part of a $200,000 EPA grant. The school was turned into a community center and was estimated to create 15 permanent jobs.
  • With $250,000 in EPA grant funding, the town of Fletcher, North Carolina turned a former log home manufacturing facility into a town hall. The project included clean-up of dioxin (a chemical that can cause reproductive and developmental problems and cancer) and pentachlorophenol (a chemical associated with cancer and other harmful impacts to human health).

According to EPA and U.S. Census data, approximately 104 million people (one-third of the U.S. population) live within three miles of a Brownfields site that received EPA funding, including more than one-third of all children under the age of five.

Reducing Lead

Thanks to the EPA’s decades-long effort to address the threat of lead pollution, blood lead levels across the country have declined more than 90 percent since the mid-1970s (see this interactive EDF graphic to learn more about the policies that helped). These efforts have protected countless children from the lifelong burden of diminished IQ from early childhood lead exposure.

However, according to the Centers for Disease Control and Prevention, at least four million households have children living in them who are still being exposed to high levels of lead —highlighting the need for continued EPA efforts and funding in this area.

Over the past five decades, EPA has worked to reduce or eliminate the use of lead in gasoline, paint, plumbing pipes, and soil. EPA provides lead reduction grants to states, territories, and tribes to help them implement programs to mitigate lead-based paint in homes. EPA also conducts extensive outreach to educate the public about the health risks of lead exposure, and manages a national certification program for contractors who work on homes containing lead. Last year, EPA took more than 100 enforcement actions to require property managers and contractors to protect vulnerable communities from the dangers of lead.

A few examples of funded EPA programs include:

  • $243,007 awarded to the Arkansas Department of Health to administer and enforce the state’s lead based paint program, which will support training for lead inspectors and lead enforcement activities, and will help protect children from lead poisoning.
  • One of EPA’s regional offices (representing Arkansas, Oklahoma, Texas, Louisiana, New Mexico and 66 tribes) provided $898,384 in grants for work on lead abatement programs,  which include providing training for lead inspectors, conducting outreach, conducting inspections of contractors engaged in lead-based paint abatement activities, and enforcement action.
  • The Ohio Department of Health was awarded more than $55,000 to develop and refine its state lead licensing program and almost $375,000 to administer its lead accreditation and certification program in FY 2016.

These programs are just a small snapshot of the lifesaving programs EPA implements to protect public health. Programs like these could be completely eliminated or severely cut if the “skinny budget” is adopted by Congress.

Posted in Health, News, Policy / Read 1 Response

America’s Leaders Weigh in on the Dangers of Proposed EPA Budget Cuts

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Details of President Trump’s budget for the Environmental Protection Agency (EPA) have started leaking out — and they are alarming, to say the least.

The reported budget cuts outline a disturbingly stark vision for the nation’s guardians of human health and the environment, cutting EPA staff by one-fifth and resources by 25 percent.

This budget would reportedly slash funding to restore the Great Lakes and the Chesapeake Bay, for state air quality grants, for environmental justice programs, for safe drinking water grants to states, and much more.

It would also reportedly gut EPA’s Office of Research and Development, the office responsible for guiding the agency’s approach to science. The Office of Research and Development includes vital work like the Safe and Sustainable Water Resources program.

This short-sighted budget proposal would mean dirtier air and water. It would mean more deaths among American citizens, and more asthma attacks among American children.

That’s why reports of a budget proposal this alarming has drawn criticism from all corners of America, from red and blue states alike.

As Jim Brainard, the Republican Mayor of Carmel, Indiana put it:

I haven’t met a Republican or Democrat yet that wants to drink dirty water or breathe dirty air.

Members of Congress from both parties, former EPA administrators serving under both Republican and Democratic Presidents, experts from state and local air agencies, environmental justice groups, and others all agree:

William Ruckelshaus, EPA Administrator for Presidents Nixon and Reagan:

A strong and credible regulatory regime is essential to the smooth functioning of our economy… Budget cuts that hurt programs that states now have in place to meet those duties run the risk of returning us to a time when some states offered industries a free lunch, creating havens for polluters. This could leave states with strong environmental programs supported by the public at a competitive disadvantage compared to states with weak programs. In other words, it could lead to a race to the bottom.

Christine Todd Whitman, EPA Administrator for President George W. Bush:

I haven’t ever really seen anything quite like this,” and on the enforcement of environmental rules, “a lot of that enforcement is protecting people.

Gina McCarthy, EPA Administrator for President Obama:

This budget is a fantasy if the administration believes it will preserve EPA’s mission to protect public health… It ignores the need to invest in science and to implement the law… It ignores the lessons of history that led to EPA’s creation 46 years ago. And it ignores the American people calling for its continued support … This is actually going to be devastating for the agency’s ability to protect public health.

WE ACT for Environmental Justice:

Trump’s proposed cuts to EPA’s programs are racist and an attack on EJ communities nationwide.

Dominique Browning, founder of Moms Clean Air Force:

No mom — whether Republican, Democrat, or Independent — voted for air pollution. No mom voted for anything that would endanger her children’s health. We’ve come a long way in cleaning up air pollution, and cutting back EPA’s efforts to enforce the rules that protect us — in favor of polluters’ profits — runs completely against what mothers and fathers across the country want: safe and clean air.

National Association of Clean Air Agencies director Bill Becker:

These cuts, if enacted by Congress, will rip the heart and soul out of the national air pollution control program and jeopardize the health and welfare of tens of millions of people around the country… I can guarantee with certainty that at least in the air pollution area, there will be many more people who will die prematurely and tens of thousands, perhaps millions more, who will get sick unnecessarily… [the cuts will have] a direct and serious adverse health impact on almost every major metropolitan area in the country.

Rep. Mike Simpson (R-Idaho):

There’s not that much in the EPA, for crying out loud. (Simpson also noted that Republicans had already reduced EPA’s budget significantly in recent years.

Rep. Tom Cole (R-Oklahoma):

EPA has been cut by over 20 percent in the last few years. The discretionary budget has been lowered pretty dramatically compared to how it was in 2009, and it’s under what [Speaker] Paul Ryan (R-Wis.) thought it would be in his budget.

Sen. Tom Carper (D-Delaware):

Reckless cuts to the EPA — the agency responsible for protecting public health and our environment — are not what Americans voted for in November.

Rep. Dave Joyce (R-Ohio):

[W]e’re not going to let that happen, we’re going to continue to oppose cuts to the [Great Lakes Restoration Initiative] and we’re going to mobilize our voting forces to let them know that this isn’t going to stand.

Sen. Debbie Stabenow (D-MI):

[Proposed cuts to the Great Lakes Restoration Initiative are] outrageous … this initiative has been critical to cleaning up our Great Lakes and waterways, restoring fish and wildlife habitats, and fighting invasive species, like Asian carp… I call on President Trump to reverse course on these harmful decisions.

John Stine, Commissioner of the Minnesota Pollution Control Agency:

It would cut across every area of our work… It would hurt the people who look to [our] programs for protecting the quality of their health and the quality of the places they live… We need people to understand that this work is not just … abstract, these are all people and places that are at some level of risk.

American Lung Association:

Slashing funding for programs that are proven to save lives is a disastrous strategy; cuts to key lung health programs at EPA and HHS make Americans less secure and less protected from known health threats such as the next influenza pandemic and air pollution. Our nation’s scientists and doctors will be less likely to find cures and better treatments for the millions of Americans with lung cancer, COPD and asthma.

Clean air, water, and other environmental safeguards are essential to Americans’ lives. The vast majority of Americans across the country support EPA’s mission – a mission the agency has been carrying out under both political parties for almost half a century, and one that that has led to incredible progress in cleaning and protecting our air and waters.

Posted in Clean Air Act, Health, News, Partners for Change, Policy, What Others are Saying / Comments are closed

Climate Confusion in the Age of “Alternative Facts”

Earth as seen from a NOAA weather satellite. Photo: NASA

A very familiar type of ad recently appeared in the New York Times. It was the sort of fact-free manifesto normally found only on the fringes of the Internet, until someone with enough money decides to buy a full page in a newspaper.

These kinds of public declarations can be about anything from ancient nationalist grudges to fad nutritional theories. This one, by an obscure South Korean firm called Samsung Chemical Coating Company (no apparent relation to the electronics company), declared that carbon dioxide pollution isn’t causing climate change and that global warming will end in 2060 and be replaced by a destructive ice age, among other similarly oddball assertions.

Usually this kind of claim is barely worth refuting, as it is flatly contradicted by the consensus of the international scientific community. But one important detail made this ad different, and more dangerous.

First, let’s be clear about the substance of the ad and the real scientific facts.

There is absolutely no scientific basis or merit to the claims being made in the ad. No actual climate scientist takes seriously catastrophes in movies like The Day After Tomorrow becoming reality, or strange theories like the idea that creatures mutated from sunlight at the end of an ice age. No information about their “study” is available on the Internet, nor in the peer-reviewed scientific literature. There is no explanation about how they arrived at their conclusions, or any discussion of the information or data that served as the basis for their claims. And if you try Googling information about the authors, you’ll come up empty.

Even the more nuanced statements in the ad about the relationships between Earth’s precession, glacial cycles, and sea level rise are unsubstantiated. The authors use these unsupported claims as “proof” that carbon dioxide emissions do not cause global warming — an argument that should not be taken seriously given the lack of any supporting data. Their claims also demonstrate a profound ignorance of established physics. And the direct “certainty” throughout the ads about specific events – such as the disappearance of Earth’s magnetic field – adds to the characteristically unscientific approach.

All of these are hallmarks of the Crazy Full Page Ad.

Here is the truth:

  • The fact that carbon dioxide and other pollutants are changing our climate in dangerous ways has been established by decades of scientific research and mountains of data – from ice core samples, satellites, and other monitoring and analysis.
  • It is a conclusion strongly endorsed by the National Academies of Science, the scientists at NASA, the National Oceanographic and Atmospheric Association (NOAA), and all major American scientific organizations.
  • These climate pollutants, which have the known physical property of trapping heat, have been building up in our atmosphere since the world started burning lots of coal for the Industrial Revolution, and global average temperatures have risen right along with that accumulation.

So if all of this is nonsense, why protest so much?

Because at this moment in history, we have – amazingly, shockingly, dangerously – an Administrator of the Environmental Protection Agency (EPA) who makes similarly outlandish claims. In an appearance on CNBC last week, Scott Pruitt said:

I would not agree that [carbon dioxide] is a primary contributor to the global warming that we see.

In essence, he said he doesn’t know if the greatest environmental challenge of our time, his biggest responsibility, is real. It’s like having a surgeon general who doubts the connection between smoking and lung cancer. Or an attorney general who doesn’t consider the drug cartels to be dangerous organizations.

The result of Pruitt’s statements was a flood of outrage, reportedly locking up EPA’s switchboards like never before. (The agency had to set up an impromptu call center, according to leaks from employees.) Commentators on the left and right were stunned, even in an era when it’s a challenge to say something crazy enough to make the front page.

So what could normally be dismissed as a fringe ad cannot be ignored. We must, unfortunately, remind Americans who instinctively assume an EPA administration would know basic environmental science of the real facts. We must stand up and calmly explain what is at stake for our children and grandchildren. At EDF, we will continue to do that.

Posted in Basic Science of Global Warming, Greenhouse Gas Emissions, News, Policy, Science / Comments are closed

Scott Pruitt Peddles Junk Science to Serve Trump’s Anti-Climate Agenda

This week has brought alarming indications that the Trump Administration is poised to roll back life-saving, common-sense climate protections with no plan for replacing them — and that the head of the U.S. Environmental Protection Agency (EPA) rejects basic facts about climate change and the clean air laws he is charged with carrying out.

These developments fundamentally threaten efforts to address climate change – the direst environmental challenge of our time.

News reports say that President Trump is on the verge of signing an executive order aimed at revoking the Clean Power Plan – the only national limits on climate-destabilizing carbon pollution from existing power plants, which are our nation’s largest source of these emissions.

EPA Administrator Scott Pruitt did an interview with CNBC in which he made the wildly inaccurate statement that there’s “tremendous disagreement” about the role climate pollution plays in climate change, and said that he does “not agree that [carbon dioxide] is a primary contributor to the global warming that we see.”

And in a second interview, on Fox Business, Pruitt questioned whether EPA has “the tools in the tool box to address [climate change],” and said “Congress has never spoken on this issue” — even though the Supreme Court has determined that the Clean Air Act, which was passed by Congress, does provide those “tools.”

Pruitt does not have a scientific background — just an extensive history of bringing highly politicized lawsuits against environmental protections, and of using his public office on behalf of the fossil fuel interests that have helped fund his political career.

His statements are not just false and misleading representations of climate science. They also call into question whether he can faithfully discharge his clear responsibility under our nation’s clean air laws to protect the public from climate pollution.

Pruitt Is Wrong on Climate Science

The U.S. government’s leading scientific agencies have conclusively determined that climate change is “due primarily to human activities” and is already manifesting itself in rising sea levels, heat waves, more intense storms, and other severe impacts felt by communities across the country.

Just in the last year, respected scientists have reported that the impact of human emissions on climate change is evident in February heat waves, devastating Louisiana storms, and flooded coastal communities.

Contrary to Pruitt’s statement that there’s “tremendous disagreement” about human impacts on climate, there is overwhelming scientific consensus that human emissions of carbon dioxide are destabilizing our climate. This consensus has been affirmed by many of our nation’s most respected scientists and scientific institutions, including:

NASA

Humans have increased atmospheric CO2 concentration by more than a third since the Industrial Revolution began. This is the most important long-lived ‘forcing’ of climate change. – NASA website

The planet’s average surface temperature has risen about 2.0 degrees Fahrenheit (1.1 degrees Celsius) since the late 19th century, a change driven largely by increased carbon dioxide and other human-made emissions into the atmosphere. – NASA press release

U.S. National Academy of Sciences

Direct measurements of CO2 in the atmosphere and in air trapped in ice show that atmospheric CO2 increased by about 40% from 1800 to 2012. Measurements of different forms of carbon … reveal that this increase is due to human activities. Other greenhouse gases (notably methane and nitrous oxide) are also increasing as a consequence of human activities. The observed global surface temperature rise since 1900 is consistent with detailed calculations of the impacts of the observed increase in atmospheric CO2 (and other human-induced changes) on Earth’s energy balance. – Climate Change: Evidence & Causes, page 5 (issued jointly with the Royal Society)

U.S. Global Change Research Program

Evidence from the top of the atmosphere to the depths of the oceans, collected by scientists and engineers from around the world, tells an unambiguous story: the planet is warming, and over the last half century, this warming has been driven primarily by human activity — predominantly the burning of fossil fuels. – U.S. Global Change Research Program website

More than 800 Earth Scientists (in a letter to then-President-Elect Donald Trump)

Publicly acknowledge that climate change is a real, human-caused, and urgent threat. If not, you will become the only government leader in the world to deny climate science. Your position will be at odds with virtually all climate scientists, most economists, military experts, fossil fuel companies and other business leaders, and the two-thirds of Americans worried about this issue. – scientists’ letter

Pruitt either refuses to accept this science, or is unaware of it – and either possibility presents a huge problem for the nation’s top environmental official.

Pruitt Has a Legal Obligation to Protect the Public from Climate Pollution

Pruitt’s assertions that “Congress has not spoken” on climate change and that EPA may lack the “tools” to address the issue show that he is just as wrong on the law as he is on climate science.

Our nation’s clean air laws require EPA to protect public health and well-being from all forms of dangerous pollution, and the Supreme Court has recognized on three separate occasions that this responsibility clearly applies to carbon dioxide and other climate-destabilizing pollutants. Contrary to Pruitt’s comments, the courts have consistently found that Congress has directly “spoken” to the issue of climate change by vesting EPA with broad responsibility and tools to address this and other emerging threats to human health and welfare.  And EPA has, in fact, put these tools into practice over the last few years by establishing common-sense protections that are reducing pollution, protecting public health, and strengthening our economy – including fuel efficiency and emission standards for cars and trucks, emission standards for power plants, and standards for oil and gas facilities.

In Massachusetts v. EPA, decided a decade ago, the Supreme Court found “without a doubt” that EPA is authorized to regulate carbon dioxide and other climate pollutants under the Clean Air Act:

Because greenhouse gases fit well within the Clean Air Act’s capacious definition of ‘air pollutant,’ we hold that EPA has the statutory authority to regulate the emission of such gases from new motor vehicles. — Massachusetts v. EPA, 2007

The Supreme Court then ordered EPA to make a science-based determination as to whether carbon dioxide and other climate pollutants endanger public health and welfare. In 2009 – after an exhaustive review of the scientific literature and over 380,000 public comments – EPA released its nearly 1,000-page finding that climate pollutants posed such a danger.

The U.S. Court of Appeals for the D.C. Circuit unanimously upheld this finding against a barrage of legal attacks by polluters and their allies (including a lawsuit by Scott Pruitt, who was then Attorney General of Oklahoma). The Supreme Court allowed that decision to stand without further review.

Two years after EPA made its determination, the Supreme Court unanimously decided in American Electric Power v. Connecticut that section 111(d) of the Clean Air Act – the provision that EPA relied upon in issuing the Clean Power Plan – clearly authorizes EPA to regulate emissions from existing power plants:

[Massachusetts v. EPA] made plain that emissions of carbon dioxide qualify as air pollution subject to regulation under the Act … And we think it equally plain that the [Clean Air] Act ‘speaks directly’ to emissions of carbon dioxide from the defendants’ plants. – American Electric Power v. Connecticut (2011)

And in Utility Air Regulatory Group v. EPA in 2014 the Supreme Court once again affirmed EPA’s responsibility to address climate pollution by finding that the Clean Air Act requires new and modified industrial facilities to adopt limits on climate pollution. Notably, at the oral arguments in both American Electric Power v. Connecticut and Utility Air Regulatory Group v. EPA, attorneys for some of the same coal-based power companies that now oppose the Clean Power Plan recognized EPA’s authority to regulate climate pollution from power plants.

As George W. Bush’s former EPA Administrator, Christine Todd Whitman, said in a recent interview:

I think, as a matter of law, that carbon is a pollutant has been settled. – (Climatewire, The Clean Power Plan is gone — and there’s no ‘replace’ – March 9, 2017)

Notably, Scott Pruitt told the Senate under oath that he would abide by this framework. He specifically said that Massachusetts v. EPA and the Endangerment Finding are the “law of the land” and that “the endangerment finding is there and needs to be enforced and respected.” Pruitt ought to keep that testimony in mind should he try to attack the bedrock legal principles requiring EPA to protect the public from harmful climate pollution.

The Facts Are Clear

There is scientific consensus that human emissions of carbon dioxide and other climate pollutants are driving dangerous climate change. And under our nation’s clean air laws, EPA is required to protect Americans from this pollution – a responsibility that Pruitt’s predecessors have carried out by taking common-sense, cost-effective steps to reduce pollution from power plants, cars and trucks, oil and gas facilities, and other sources.

It’s outrageous and unacceptable that the principal federal official charged with carrying out this solemn responsibility is relying on “alternative facts” peddled by climate deniers to shirk his responsibility under the law.

 

Posted in Basic Science of Global Warming, Clean Air Act, Clean Power Plan, Energy, Extreme Weather, Greenhouse Gas Emissions, News, Policy, Science, Setting the Facts Straight / Read 3 Responses