This post is by Sheryl Canter, Online Writer and Editorial Manager at Environmental Defense.

This year's Nobel Peace Prize went to people fighting global climate change. What does fighting climate change have to do with world peace? Here's the answer that Michael Oppenheimer, Ph.D., one of the team of authors of the IPCC's 2007 reports and science advisor to Environmental Defense, gave in an interview with PBS:

A stable climate helps keep the peace. We see situations all around the world where shortages of the sorts of resources that will shrivel under a changing climate, like water for food, water for agriculture, are contributory factors in places like Darfur, the Horn of Africa, where instability is rife, and governments just can't hold it together, and people die. That's ultimately why this is justifiably a prize for peace.

The author of today's post, Sheryl Canter, is an Online Writer and Editorial Manager at Environmental Defense.

Today Al Gore and the IPCC received the Nobel Peace Prize in recognition of their efforts to raise public awareness and understanding of the global climate change crisis. We applaud them, and also the Nobel committee for recognizing the threats global warming poses to security and stability around the world.

Congress now has the opportunity to make the U.S. a leader on climate change by harnessing the unprecedented momentum for strong policies to cap and cut greenhouse gas emissions.

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The second installment of the IPCC's 4th Assessment on Climate Change, titled "Impacts, Adaptation and Vulnerability", was released on April 6, 2007. In recognition of this report, I'm doing a weekly series called "Climate Dangers You May Not Know About".

1. More Acidic Oceans
2. Drinking Water and Disease
3. Shifts in Lifecycle Timing
4. Drought and Violence
5. Melting of the North Pole

What happens when there isn't enough food and water for the people who need it? Fighting can ensue. And when drought and famine extend over a wide area, the fighting can escalate to civil war. This is what's happening today in Darfur, a country in the sub-Saharan (or "Sahel") region of Africa.

We can't say for sure that the Darfur droughts were caused by global warming, but there's evidence it was a significant factor (for example, see this recent study of the Sahel drought [PDF] by NOAA's Geophysical Fluid Dynamics Laboratory). But whether those past droughts were caused by global warming is not the main issue. We know that global warming will cause more and more severe droughts in the future, especially in the Sahel region of Africa.

The story of Darfur cautions that events triggered by global warming can lead to a human tragedy of global proportions.

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