Global warming controversy

The latest draft climate report leaked from the UN stresses the threat of severe and “irreversible” changes in the climate system by the end of this century. But just what does that mean?

John Fasullo’s trying to get some of the uncertainty out of predicting climate change. He says many of our current models aren’t accurate, and are being used to under-represent the consequences of our warming planet.

Four years ago, there was political consensus that climate change was one of the most pressing issues facing the world and the U.S. But now, after a great deal of spending and lobbying, politicians are refusing to do anything about it. A new documentary looks at why.

A new report says denial, uncertainty, lack of control and mistrust of scientists contribute to public inaction on climate change.

A look at human behavior and why it’s so hard for us to get our brains to choose environmentally-friendly options.