Sunlight Striking Earth’s Surface in One Hour Delivers Enough Energy to Power World Economy for the Entire Year

In April 1954, top scientists gathered in Washington, D.C., to hear something new: voice and music broadcast by a solar-powered radio transmitter. Scientists at Bell Labs in New Jersey were demonstrating their invention, the first practical solar cell, which was made of silicon. This breakthrough paved the way for the solar revolution taking place today on rooftops and in massive ground-mounted solar farms around the world. Read More |

As solar power installations spread, it is worth remembering a point often made in the energy literature to convey the sheer scale of the solar resource: The sunlight striking the Earth’s surface in just one hour delivers enough energy to power the world economy for one year.

Washington, DC claims crown of greenest U.S. city |

With its installation of 1.2 million square feet of green roofs in 2014, Washington, DC can quite literally claim the crown of greenest U.S. city.

This is according to a new report from the nonprofit Green Roofs for Healthy Cities (GRHC), which has ranked the top ten North American metropolitan regions that have installed the most square footage of green roofs last year. Green roofs aren’t just good for the environment. A new study from the University of Melbourne found that observing nature for 40 seconds or more can prominently increase attention and productivity levels.
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