How Do Living Green Walls Work?

Green walls [http://brightagrotech.com/building-a-living-green-wall/] are finally catching on as a means of beautifying our cities, our offices and our backy…

India open to solar energy — but bound to coal

India’s new prime minister, Narendra Modi, has vowed to spend more on solar projects. But Seth Doane found that for now, coal is still the cheapest and most viable energy source.