August 16th, 2010
The U.S. space agency NASA says this year has been the warmest for the earth in 131 years. And a new study of hot weather in the U.S. released by the National Wildlife Federation predicts that extreme heat will be the norm by 2050. The private environmental organization says as the planet warms, there will also be heavier rainfall and drought around the globe. But not all scientists agree on the impact of global warming or a solution to its effects:



Barbara Kessler
Andrew Winston
Danielle Nierenberg
Anthony Swift