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

Some 3 million years ago, when the earth was a little more than 3°C warmer than preindustrial levels (about 2.2°C warmer than today), Antarctica had far less ice and sea levels were a stunning 25 meters higher than today. If we stay on our current emissions path, the planet will almost certainly be that warm by the century's end.

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.

On our current path, all our great Gulf and Atlantic coast cities are at risk of meeting the same fate as New Orleans.

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

In 2003... the White House conspired with an oil-company funded think tank to block a major government scientific report that sought to spell out the dangers of climate change to Americans.

Much of the scientific community has been astonished that their increasingly strong and detailed warnings have been either ignored or attacked.