Looking back one, two and five years ago today on Worldchanging:
Graphic Series: Earthly Ideas, Pervious Concrete
Andy Lubershane shares a cartoon describing pervious concrete -- one type of material that's helping to ease the impact of the built environment on natural ecosystems and watersheds.
How Do We Intelligently Discuss Politicized Geoengineering?
Alex Steffen reflects on the growing politicization of the geoengineering debate and the need for more nuanced and open discussion...
James Cascio looks at LEDs and the work of Evan Mills, a scientist at the Lawrence Berkeley Lab's Environmental Energy Technologies Division, specializing in the ways in which developing regions provide lighting...