A Breath of Fresh Air
Google Earth is becoming a useful tool in the tracking and fighting of global warming. The U.S. Environmental Protection Agency's has created a KML file that tracks air emission sources.
The layer also shows which companies are generating air pollutants at the highest rates by selecting a given location and viewing placemarks of all of the companies in the area.
Via: Google LatLong: A breath of fresh air
The National Snow and Ice Data Center has a time animation which shows the extent of ice melting in September of each year since 1979. The animation quite clearly shows that the melting this summer is dramatically worse than in previous years.
Via: Google Earth Blog