Replacing half of the U.S. ground-transport fuels with hydrogen from wind power by 2050, for example, might require 1,400 gigawatts of advanced wind turbines or more... replacing those fuels with electricity might require less than 400 GW.

As long as a handful of U.S. scientists, most receiving funds from the fossil fuel industry, get equal time with hundreds of the world's leading climate scientists, the public inevitably ends up with a misimpression about the state of our scientific understanding.

The entire western Siberian sub-Arctic region is melting, and it has all happened in the last three or four years.

The United States could dramatically reduce its carbon emissions per kilowatt-hour without raising its overall energy bill.

The best thing about improvements in health care is that all the climate-change deniers are now going to live long enough to see how wrong they were.

Replacing half of the U.S. ground-transport fuels with hydrogen from wind power by 2050, for example, might require 1,400 gigawatts of advanced wind turbines or more... replacing those fuels with electricity might require less than 400 GW.

When people ask me what they should do, I reply, "Get informed, get outraged, and then get political."