By Ann Carlson and Dan Emmett

Every major meteorological organization in the world agrees that 2010 was the hottest year on record, continuing a dangerous trend. Texas is experiencing the worst drought in its history. Lack of rain has created massive food shortages and human catastrophe...

Today's announcement by EPA Administrator Lisa Jackson that the Environmental Protection Agency is proposing to regulate greenhouse gas emissions (GHGs) from factories, utilities and refineries is a big deal. The proposed rule would require new businesses and businesses that modify their operations and that emit 25,000 or more...

In what is a huge victory for California and a strong national commitment to more fuel efficient cars, the Obama administration will reportedly grant California its waiver to issue tough greenhouse gas emissions standards while at the same time combining those standards with a new national Corporate Automotive Fuel...

An obvious question about the raging wildfire in Santa Barbara is whether climate change is the cause. While it's impossible to blame any individual fire on increasing temperatures, we know that climate change is responsible for more frequent and more intense wildfires in the southwest. But less obvious and at...

We're not even 85 days into the Obama Administration and yet the signs of environmental change are all around us. The EPA announced today its formal determination under the Clean Air Act that greenhouse gases are pollutants that endanger public health and welfare. This is only the latest in...

Last Sunday's New York Times Magazine story about climate skeptic Freeman Dyson has me worried. For those readers who missed it, the profile is a largely favorable piece about Institute for Advanced Study scholar Dyson, best known for helping unite qunatum and electrodynamic theory and for his belief that...

Three days ago I suggested - naively - that perhaps the Bush Administration would turn in the right direction on climate change and grant California a waiver to regulate greenhouse gas emissions from automobiles. It hasn't and the EPA didn't. Continuing its record as the worst environmental administration in history,...

This week, for the first time since he took office in 2001, George Bush and his administration offered two glimmers of hope in ongoing efforts to reduce greenhouse gas emissions. The administration agreed to commit to international talks to negotiate a post-Kyoto protocol treaty to take effect in 2012. Bush...

Contrast these two Bush Administration positions. Yesterday, 10,000 participants began two weeks of meetings in Bali in an attempt to negotiate a new international agreement to limit carbon emissions quickly and dramatically. The Bush Administration -- which only recently decided even to send a delegation to the talks - has...

Last Saturday, the UN Intergovernmental Panel on Climate Change issued its most definitive report ever on global warming -- saying that "warming of the climate is unequivocal." At the same time, three Democratic presidential candidates debated global warming and energy policy on stage in Los Angeles. The debate received almost...