Global Warming - Dimming the Sun - 04

Dimming the Sun PBS Airdate: April 18, 2006 NARRATOR: He warned us, more than 25 years ago, that human activity was changing the Earth'sclimate. Since then, the world has gotten hotter, and NASA scientist James Hansen's warning has been echoed by the vast majority of climate scientists everywhere. Google is proud to support NOVA in the search for knowledge: Google. Major funding for NOVA is provided by the Howard Hughes Medical Institute, serving society through biomedical research and science education: HHMI. And by the Corporation for Public Broadcasting, and by contributions to your PBS station from viewers like you. www.pbs.org JAMES HANSEN: In a way, it is unfortunate that the small particles were in the atmosphere because we would have realized much earlier that the...how strong the greenhouse effect is, and would have had more time to make the adjustments that are going to be necessary to slow down and eventually stop the growth of greenhouse gases. NARRATOR: Despite the cooling from global dimming, scientists agree that over the past century or so, average temperatures have risen between .6 and .8 degrees Celsius, about one to one and a half degrees Fahrenheit. The increase, small as it may seem, is very fast by the standards of Earth history, but now we face something much faster. Ironically, if we keep bringing particle pollutants down—with great benefits to health—but continue pumping greenhouse gases into the atmosphere, Peter Cox believes we could be creating ...
Video Rating: 4 / 5