Photo: Flickr, CC A Nice Earth Day Present The planet got an Earth Day present from the U.S. Department of Energy (DOE) this year; Dr. Steven Chu has announced that the DOE will invest more than $200 million over 5 years to "expand and accelerate the development, commercialization, and use of solar and water power technologies throughout the United States." It's a welcome investment since the foundation of any sustainable civilization is clean energy; even if you get a lot of the rest right, if you are still powered by dirty sources,...Read the full story on TreeHugger