Category Archives: Scientists & Methods

A Great Day for Science Too: More on the Court Decision Affirming Historic Climate Protections

On good days, the facts prevail — and Tuesday was one of those very good days.

As Fred wrote, on Tuesday the U.S. Court of Appeals for Washington, D.C. issued a unanimous, historic decision upholding EPA’s actions to reduce climate pollution.

In our press release, Fred called it a good day for the “thin layer of atmosphere that sustains life on Earth.”

He’s right of course. But our planet wasn’t the only big winner. It was also a great day for science.

The court roundly rejected challenges to EPA’s science-based finding that greenhouse gas emissions endanger public health and welfare (commonly called the Endangerment Finding).

In the process, the court reaffirmed the importance of having rigorous, independent science as the bedrock of efforts to protect our health and environment.

The court’s eloquent statement speaks for itself:    

EPA simply did here what it and other decision-makers often must do to make a science-based judgment:  it sought out and revised existing scientific evidence to determine whether a particular finding was warranted.  It makes no difference that much of the scientific evidence in large part consisted of “syntheses” of individual studies and research.  . . .  This is how science works.  EPA is not required to re-prove the existence of the atom every time it approaches a scientific question.

(That’s from page 27 of the ruling. I added the emphasis.)

The court dismissed the challenges to the Endangerment Finding as without “merit”, noting that EPA relied upon an “ocean of evidence” including 18,000 peer-reviewed studies. (You can find those quotes on pages 26, 34 and 38 of the decision.)  

In dismissing this challenge the court acted in concert with our long history of relying on science-based evidence — not only to shape our health and environmental protections, but as the foundation of American innovation and ingenuity. 

EPA’s Endangerment Finding is based on an extensive review of climate change research, including assessments of climate research prepared by the National Research Council of the National Academy of Sciences, the United States Global Change Research Program, and the Intergovernmental Panel on Climate Change

The creation of these assessment reports involved thousands of scientists, reviewing thousands of articles from peer-reviewed research journals.

This massive body of research documents the effects that rising atmospheric concentrations of heat-trapping emissions are having on our climate. It also documents the harm that climate impacts cause to human health and welfare. 

Affirming EPA's reliance on state-of-the-art climate science, the court discussed the substantial evidence supporting EPA’s Endangerment Finding on page 30 of the decision:

To recap, EPA had before it substantial record evidence that anthropogenic emissions of greenhouse gases “very likely” caused warming of the climate over the last several decades. . .  Relying again upon substantial scientific evidence, EPA determined that anthropogenically induced climate change threatens both public health and public welfare.  It found that extreme weather events, changes in air quality, increases in food- and water-borne pathogens, and increases in temperatures are likely to have adverse health effects … The record also supports EPA’s conclusion that climate change endangers human welfare by creating risk to food production and agriculture, forestry, energy, infrastructure, ecosystems, and wildlife. 

The call from scientists worldwide urging swift action to curb climate-destabilizing emissions has been heard. 

EPA’s efforts to fulfill its statutory responsibility to protect human health and the environment from dangerous pollution have been resoundingly affirmed.   

It is a good day to be a scientist, and an American.

(You can read more about the court cases on our website and in my colleague Megan Ceronsky’s earlier blog on the subject. And stay tuned for more analysis of the historic decisions.)

Also posted in Basic Science of Global Warming, Clean Air Act, Greenhouse Gas Emissions, Links and Quotes, Policy, Science, Science - General | Comments closed

Inhofe's Report: Why It's Wrong

James WangThis post is by James Wang, Ph.D., a climate scientist at Environmental Defense.

Climate change denier and U.S. Senator James Inhofe (R-Okla) published a report just before Christmas with the headline: "Over 400 Prominent Scientists Disputed Man-Made Global Warming Claims in 2007." Does that leave you surprised and wondering? It shouldn't. It's a shocker of a headline, but the report itself doesn't back up the claim.

Read More »

Posted in Scientists & Methods | Comments closed

How the IPCC Got Started

This post is by Michael Oppenheimer, Ph.D., the Albert G. Milbank Professor of Geosciences and International Affairs in the Woodrow Wilson School and the Department of Geosciences at Princeton University. He also serves as science advisor to Environmental Defense.

The award of the 2007 Nobel Peace Prize to Al Gore and the Intergovernmental Panel on Climate Change (IPCC) is an important milestone in the journey toward a global warming solution, and it got me thinking about how the IPCC came to be. To some extent, it was thanks to a miscalculation by the Reagan Administration!

Read More »

Posted in Scientists & Methods | Comments closed

Predicting Short-Term Change

The author of today"s post, Lisa Moore, Ph.D., is a scientist in the Climate and Air Program.

Climate models are usually run far into the future, projecting temperature changes to the end of the century. Over the long term, the effects of greenhouse gases overwhelm all other factors. But climate can have substantial "short-term internal variability" – for example, temperature shifts due to El Niño and La Niña. Climate models have never been able to predict this internal variability – until now.

Read More »

Posted in Scientists & Methods | Comments closed

Scientific Uncertainty

The author of today's post, Lisa Moore, is a scientist in the Climate and Air Program.

I've been reading a great book called Uncertain Science… Uncertain World by Henry Pollack – a readable and engaging discussion of decision-making in the face of uncertainty. Pollack argues that decision-makers use uncertainty as an excuse for inaction, when in fact it should be a stimulus for creativity and progress.

How sure do you have to be that something will happen to act on the possibility?

Read More »

Posted in Scientists & Methods | Comments closed

Climate Models: How Good Are They?

The author of today's post, Lisa Moore, is a scientist in the Climate and Air Program.

Stephen Colbert once quipped, "It's not that I don't believe in climate change, it's that I don't believe in climate. Have you ever heard anyone say, "How's the climate?" No! They say, "How's the weather?""

People often confuse climate and weather. They wonder how scientists can reliably predict climate 50 years from now when they can't predict the weather a few weeks from now. The answer is that climate and weather are different, and it's easier to predict climate than weather.

Read More »

Posted in Scientists & Methods | Comments closed

Climate Models: How They Work

Lisa Moore is a scientist in the Climate and Air Program.

Of everything in climate science, what seems to spark the most skeptical questions is our use of computer models. In this post and another to follow, I'll talk about exactly what these models do, and how they contribute to our understanding of global warming.

I'll start with why we use models in the first place. We want to project what will happen to our climate in the future – will it be warmer? How much warmer? Will it change in different ways in different places? Climate models use our knowledge of how the climate system works to calculate what different emissions scenarios mean for the future. Here's how the models are built.

Read More »

Posted in Scientists & Methods | Comments closed

Lincoln’s Little-Known Legacy

This post is dedicated to the two great Americans we will honor on Presidents’ Day this Monday.

Everybody knows about Abraham Lincoln’s Emancipation Proclamation and Gettysburg Address; they are a big part of why Lincoln's birthday is honored. Most people don't know that Lincoln also established the National Academy of Sciences (NAS).

Read More »

Posted in Scientists & Methods | Comments closed

What is the IPCC, anyway?

Reports about the new 2007 IPCC assessment on climate change have been all over the news. The findings are sobering – the globe is warming largely because of human activities, the effects are already being felt, and if we don't curb greenhouse gas pollution soon the consequences could be catastrophic.

But some folks are not so sure about this IPCC thing. They want to know: "What is the IPCC anyway, and why should I trust what they have to say?" Our good friends at the Wall Street Journal tell us not to trust the IPCC, it's written by a bunch of "policymakers." (See the editorial.)

Not so fast. Here's what the IPCC really is. Read More »

Posted in Scientists & Methods | Comments closed