Climate 411

3 reasons the Zika outbreak may be linked to climate change

By Ilissa Ocko / Published: February 17, 2016

The regions that the Zika virus outbreak has struck hardest, such as Brazil and Colombia, also happen to be areas that are currently plagued by hotter-than-usual temperatures.

So is there a connection?

The ways that virus-carrying mosquitoes change their behavior with warmer temperatures may, in fact, point to a link between the Zika outbreak and climate change like the one that exists with malaria, Lyme Disease and other ills.

While it’s important to remember that it’s probably a combination of reasons for the current Zika virus outbreak – including movement of people and available breeding grounds – there are three ways in particular that warmer weather may be contributing to the crisis:

graphic_v3 (2)

1. Hotter temperatures make mosquitoes hungrier

Female mosquitoes require blood meals for reproduction. Along with many cold-blooded animals, mosquitoes feed more frequently with higher temperatures. The more they eat, the likelier they are to get infected and spread the disease.

2. Warm air incubates the virus faster

A virus must incubate inside a mosquito before the mosquito becomes infectious. That takes about 10 days, roughly a mosquito’s lifespan, so the mosquito will often die before it can spread the disease.

But hotter temperatures speed up the incubation process in the cold-blooded mosquito, because the virus can replicate faster. This means that the mosquito will be alive longer while infectious, thus having more time to transmit the disease.

3. Mosquito territory expands as the climate warms

Mosquitoes flourish in warm climates, restricting their range based on temperature. But with climate change, plants and animals are moving northward and upward, and we know mosquitoes do the same as new areas become warmer and a suitable habitat.

As mosquitoes expand their range, they can introduce diseases to populations that otherwise would have been safely out of reach. The distribution of the Zika-carrying mosquito, in particular, has wildly increased over the past few decades, which have also been the hottest decade on Earth in more than 1,000 years.

In fact, the current epidemic took off in 2015, the hottest year in South America and globally since record-keeping began 136 years ago.

The links between mosquitoes and temperature are scientifically clear, and it’s possible that climate change may now be playing a role in the spread of the Zika virus, a disease suspected of causing serious birth defects.

To know for sure, and to help nations deal with the outbreak, more research is needed to tease out the specific causes of this global catastrophe.

This post originally appeared on our EDF+Voices blog.

Also posted in Health, News, Plants & Animals / Comments are closed

Climate Change and Millennials – An Entire Lifetime of Warmer Than Average Temperatures

By Ilissa Ocko / Published: January 21, 2016

While reading the announcement that 2015 had broken – indeed, shattered – the hottest year on record set by 2014, there was one fact that really made things personal: we have now had 31 straight years since a single month was cooler than the twentieth century global average temperature. That means that I have never lived through a month that wasn’t warmer than average – never once in my lifetime.

My entire career as a climate scientist is focused on reducing the threat of global warming, and yet I have never even been alive at a time when the climate was stable. I technically don’t even know what normal is.

Warmest Years on Record graphic

So on one hand, you could say that I don’t even know what I am fighting for. On the other hand, I’ve been afforded two unique opportunities because I’ve lived in the shadow of global warming my entire life.

First, because I’ve grown up at a time when heat records are broken over and over again, I was aware of this worldwide crisis during those impressionable and important “pick a major” years of college. I was thus able to set myself on a career path shaped by climate change from the get-go, rather than later on in life once I was already an established professional in something else.

Second, because my elder colleagues have already identified – with extreme confidence – that humans are the main cause of climate change, I’ve been able to focus on solutions from the get-go, and not just causes and impacts. I have thus benefitted from previous scientific research because I could explore avenues to address climate change, because if humans are the cause, then we are also the solution.

And it’s not just me; there is now an entire generation of young people motivated and empowered to do something about climate change. We – almost the entire millennial generation – have never lived in a world without global warming.

Perhaps for similar reasons to mine (and/or because we think we’re special), my generation has shown a propensity for not just caring about climate change, but doing something about it. Whether on their campuses of their schools or the communities where they live, my generation is showing that they want solutions. In fact, eighty-percent of millennials support cleaner energy in the U.S., regardless of party affiliation.

For this reason among others, I am more hopeful about our future than ever before. Climate change has been impacting my generation our whole lives, but it doesn’t have to stay that way. We didn’t ask for this challenge, but I truly believe we’ll be able to rise up to meet it.

Also posted in Basic Science of Global Warming, Extreme Weather, Greenhouse Gas Emissions, News / Read 1 Response

Defending Our Future: Fighting Climate Change in South Florida

By Lucía Oliva Hennelly / Published: November 23, 2015
Speakers at the Defend Our Future/Voto Latino event: (back row) Alexis Calatayud, FIU Student Body President; Eric Chappell, Climate Corp alum; Edwin Luevanos, Citizen Energy; Mustafa Santiago Ali, EPA; (front row) Enrique Acevedo, Univision; Karina Castillo, CLEO Institute/MCAF

Speakers at the Defend Our Future/Voto Latino event: (back row) Alexis Calatayud, FIU Student Body President; Eric Chappell, Climate Corp alum; Edwin Luevanos, Citizen Energy; Mustafa Santiago Ali, EPA; (front row) Enrique Acevedo, Univision; Karina Castillo, CLEO Institute/MCAF

On Tuesday night Defend Our Future, EDF’s initiative to empower young people to fight climate change, partnered with Voto Latino, an organization that empowers Latino Millennials to claim a better future for themselves and their community, to bring a Power Summit “Pop Up” to Florida International University (FIU). We brought together 100 area youth leaders to engage in an evening of conversation focused on how young Latinos can fight climate change in South Florida. In Miami, in particular, addressing climate change is a critical part of this equation, and seeing a room full of rising leaders ready to take action was inspiring.

To kick off the conversation, Environmental Protection Agency (EPA) Senior Advisor on Environmental Justice, Mustafa Santiago Ali, reminded the crowd:

We need to be laser-focused on climate change.

He shared his story about growing up near a power plant in West Virginia, and reminded us about the importance of protecting our communities from the interconnected threats of air pollution and climate change. This is especially true, Ali said, for Latinos and African-Americans because climate change can compound other serious threats to our health and well-being. Read More »

Also posted in Basic Science of Global Warming, Latino partnerships, Partners for Change / Comments are closed

4 undeniable signs we’re making progress on climate change

By Fred Krupp / Published: September 11, 2015

Seven months ago, I made a strong statement that may have left some people shaking their heads. I said that we can turn the corner on climate change – end the centuries-long rise in greenhouse gas emissions and see them peak and begin to decline – in just five short years.

As it turns out, 2015 is shaping up to be a year of giant steps toward that goal.

In a deeply reported New York Magazine piece, political writer Jonathan Chait calls it “the year humans finally got serious about saving themselves.” Says Chait, “The world is suddenly responding to the climate emergency with – by the standards of its previous behavior – astonishing speed.”

I agree. Here are four reasons I believe we’re headed in the right direction:

1. America is tackling greenhouse gas pollution

The United States remains among the world’s largest per-capita emitters of carbon dioxide and other heat-trapping pollutants. But thanks to this year’s action by the Environmental Protection Agency, America now has a Clean Power Plan that will cut emissions from power plants, our single largest source of carbon, by 32 percent over the next 15 years.

The era of unlimited climate pollution is over.

On the heels of the EPA’s Clean Power Plan came a proposed rule to cut methane from newly built facilities in the oil and gas industry. More needs to be done, but this is an important step in dealing with a potent greenhouse gas that accounts for 25 percent of Earth’s current warming.

These climate laws will help the U.S. meet our target to reduce emissions by 26-28 percent below 2005 levels by 2025, a commitment we made to the international community that is key to getting other large polluters to do their share.

We’ll need further reductions, but this is a very significant start.

2. China is building momentum for global action

The world’s No. 1 greenhouse gas emitter, China submitted its climate plan to the United Nations in June, confirming it will let emissions peak by 2030 – and possibly sooner. I know from my colleague Dan Dudek in China that “sooner” is possible because this is a country that’s serious about climate action.

Pollution is choking Chinese cities and threatening economic growth, but the country’s leaders also see opportunity in the emerging clean energy industry. China has pledged to have 20 percent of its energy come from wind, solar and other non-fossil energy sources within 15 years – a massive investment in a nation of 1.4 billion.

This year alone, China is expected to add 18 gigawatts of new solar capacity. By comparison, the U.S. recently surpassed 20 gigawatts total.

To have China and the U.S. making such significant commitments has transformed the dynamic going into the U.N. climate summit in Paris. Instead of making excuses for inaction, the leading emitters have launched a virtuous cycle of increasing ambition.

That changes everything.

3. Clean energy is lifting people out of poverty

One billion people worldwide still have no energy, and more than 1 billion live in extreme poverty. Turning the corner on climate cannot mean that economies can’t develop.

But just as some developing economies adopted cellular technology without ever having land lines, some will leap-frog the dirty energy phase of economic development and go straight to clean.

In fiscal 2014, the World Bank more than doubled lending for renewable energy projects to nearly $3.6 billion – or 38 percent of its total energy lending.

As Rachel Kyte, the bank’s vice president and special envoy for climate change, recently said, what poverty-stricken people of the world need now is a “a low-carbon revolution.”

And this is starting to happen. In 2014, the emerging economies of China, India, Brazil and South Africa invested $131 billion in clean energy, just 6 percent less than the developed world did.

4. Pope Francis is galvanizing world opinion 

When Pope Francis released his much-anticipated encyclical on environmental stewardship in June, he made an urgent moral appeal to the world.

As my colleague Paul Stinson noted at the time, “A leading voice without political boundaries, the pope has the ability to reach people who previously could not or would not face the reality of climate change.”

Pope Francis called on us to push harder to replace fossil fuel with renewable energy sources – and people are listening.

The day he speaks to Congress later this month, a climate rally is expected to draw many thousands to the nation’s capital in a unified call for action. Environmental Defense Fund will be there, too.

The momentum is growing. We’re on our way to turn the corner on climate change – and the race of our lives is on.

This post originally appeared on our EDF Voices blog.

Also posted in Clean Air Act, Clean Power Plan, Energy, Greenhouse Gas Emissions, International, Policy, Setting the Facts Straight / Comments are closed

Urgency and Opportunity for Latino Leadership on Climate

By Lucía Oliva Hennelly / Published: June 26, 2015
Las Vegas -- Wikimedia Commons

Las Vegas — Wikimedia Commons

When I landed in Las Vegas last week, the weather was a broiling 108 degrees. Ouch.

I braved the Las Vegas heat for one of the most inspiring convenings of Latino leaders in the country, the Annual Conference of the National Association of Latino Elected Officials (NALEO). We had a chance to hear from established and rising Latino leaders, as well as from Presidential candidates, about the challenges facing Latino communities and the many paths forward for creating a brighter future.

What we did not hear about was a vision for places like Las Vegas, where summer temperatures are bound to get hotter and water will become even more scarce in the face of climate change. In fact, there was no formal conversation about what climate change means for the U.S., and specifically for Latinos.

Here’s the short version of the missing conversation on climate: climate change presents challenges to everyone but it is having, and will continue to have, a disproportionate impact on Latinos in the United States.

To illustrate, let’s look at the three states that house more than half the Latinos in the US:

  • California, and the state’s majority Latino population, is facing its fourth year in historic drought that’s been exacerbated by climate change.
  • This summer, Texas experienced unprecedented flooding, nearly canceling out the state’s prior state of drought, in a demonstration of the kind of extreme weather linked to climate change.
  • Florida’s real estate and freshwater is already threatened by initial increases in sea-level rise, which are also eroding the state’s beaches.

There are more than 28 million Latinos facing climate threats in these three states alone. That does not count the millions of other Latinos nationwide who will face extreme heat and longer wildfire seasons in the Southwest this summer. It does not account for all 49 percent of Latinos nationally who live in coastal communities and will face more frequent and intense hurricanes and flooding. It also does not account for the full 14 percent of Latino kids diagnosed with asthma, who will face greater challenges to managing this condition due to more days with unhealthy levels of smog.

That was the bad news. It points to the fact that our leaders should not ignore the impacts of climate change on the Latino community. As climate impacts the air we breathe, threatens water we use for drinking, swimming, farming, and fishing, and even endangers our health, leaders at all levels need to take a proactive stance to protect our communities by addressing climate change.

Here’s the good news — the support is already there to act on climate. National polling has shown that 63 percent of Latinos think the federal government should act broadly to address global warming, while 8 in 10 Latinos want the President to curb the carbon pollution that causes climate change.

There are also some great opportunities hidden among the challenges. For example, today’s clean energy economy is creating more jobs than the fossil fuel economy. Jobs in the clean energy economy also offer higher wages to a wide range of workers, relative to the broader economy.

Which brings me back to Vegas. While there was no formal climate change discussion on the program, Latino environmental leaders from around the country were sparking conversations in the halls about conservation, climate change, and la comunidad. Advocates from New Mexico’s Hispanics Enjoying Camping, Hunting, and Outdoors talked with conference guests about the importance of protecting our public lands. Colorado’s Nuestro Rio shared their work protecting the Colorado River and our bond to this precious resource.

EDF also played a role, teaming up with GreenLatinos, Green 2.0, and Nuestro Rio to host a reception and highlight the importance of addressing climate change at a national level. Nearly everyone we spoke with about our work was interested in hearing about solutions and how to do more.

As we participated in conference events last week, Pope Francis reminded us that we “have the duty to protect the earth and ensure its fruitfulness for coming generations.” Latino communities, and our leaders, are no exception. We have a duty to address climate change — protecting our families, our children, and our climate is something we cannot afford to gamble on.

Also posted in Clean Power Plan, Extreme Weather, Greenhouse Gas Emissions, Jobs, Latino partnerships, News, Partners for Change / Comments are closed

Six Climate Tipping Points: How Worried Should We Be?

By Ilissa Ocko / Published: June 17, 2015

One of the biggest fears about climate change is that it may be triggering events that would dramatically alter Earth as we know it.

Known to scientists as “tipping events,” they could contribute to mass extinction of species, dramatic sea level rise, extensive droughts and the transformation of forests into vast grasslands – among other upheavals our stressed world can ill afford.

Here are the top six climate events scientists worry about today.

1. The Arctic sea ice melts

The melting of the Arctic summer ice is considered to be the single greatest threat, and some scientists think we’ve already passed the tipping point.

As sea ice melts and the Arctic warms, dark ocean water is exposed that absorbs more sunlight, thus reinforcing the warming. The transition to an ice-free Arctic summer can occur rapidly – within decades – and this has geopolitical implications, in addition to a whole ecosystem being disrupted.

Photo: Smudge 900)

2. Greenland becomes ice-free

The warming of the Arctic may also render Greenland largely ice-free. While Greenland’s ice loss will likely reach the point of no return within this century, the full transition will take at least a few hundred years.

The impacts of the Greenland ice melt is expected to raise sea levels by up to 20 feet.

Half of the 10 largest cities in the world, including New York City, and one-third of the world’s 30 largest cities are already threatened by this sea level rise. Today, they are home to nearly 1.8 billion people.

Other vulnerable American cities include Miami, Norfolk and Boston.

Photo: siralbertus

3. The West Antarctic ice sheet disintegrates

On the other side of Earth, the West Antarctic ice sheet is also disintegrating. Because the bottom of this glacier is grounded below sea level, it’s vulnerable to rapid break-up, thinning and retreat as warm ocean waters eat away at the ice.

Scientists expect the West Antarctic ice sheet to “tip” this century, and there is evidence that it already began happening in 2014.

However, the entire collapse of the glacier, which would raise sea level by 16 feet, could take a few hundred years.

Photo: BBC World Service

4. El Niño becomes a more permanent climate fixture

The oceans absorb about 90 percent of the extra heat that is being trapped in the Earth system by greenhouse gases. This could affect the ocean dynamics that control El Niño events.

While there are several theories about what could happen in the future, the most likely consequence of ocean heat uptake is that El Niño, a natural climate phenomenon, could become a more permanent part of our climate system.

That would cause extensive drought conditions in Southeast Asia and elsewhere, while some drought-prone areas such as California would get relief.

The transition is expected to be gradual and take around a century to occur – but it could also be triggered sooner.

Photo: Austin Yoder

 5. The Amazon rain forest dies back

Rainfall in the Amazon is threatened by deforestation, a longer dry season, and rising summer temperatures.

At least half of the Amazon rainforest could turn into savannah and grassland, which – once triggered – could happen over just a few decades. This would make it very difficult for the rainforest to reestablish itself and lead to a considerable loss in biodiversity.

However, the reduction of the Amazon ultimately depends on what happens with El Niño, along with future land-use changes from human activities.

Photo: World Bank

 6. Boreal forests are cut in half

Increased water and heat stress are taking a toll on the large forests in Canada, Russia and other parts of the uppermost Northern Hemisphere. So are forest disease and fires.

This could lead to a 50-percent reduction of the boreal forests, and mean they may never be able to recover. Instead, the forest would gradually transition into open woodlands or grasslands over several decades.

This would have a huge impact on the world’s carbon balance because forests can absorb much more carbon than grasslands do. As the forest diminishes, the climate will be affected as will the Earth’s energy balance.

However, the complex interaction between tree physiology, permafrost and fires makes the situation tricky to understand.

Photo: Gord McKenna

Other concerns…

As if that’s not enough, there are a few other tipping events that scientists are also concerned about, but they are even more complex and harder to predict. Examples of such events include the greening of the Sahara and Sahel, the development of an Arctic ozone hole and a chaotic Indian summer monsoon.

How do we keep from tipping over?

We know from measurements that the Earth has had many climate-related tipping events throughout its history. Today’s situation is different, because humans are now driving these changes and the warming is occurring at a faster rate.

But as humans we also have the power to change the trajectory we’re on – possibly in a matter of a few years. We think we know how.

Also posted in Arctic & Antarctic, Basic Science of Global Warming, Extreme Weather, Greenhouse Gas Emissions, Oceans, Plants & Animals / Read 1 Response