World's largest tidal power turbine unveiled in Scotland.

In spite of exponential growth, farmers markets still only account for a tiny proportion of U.S. food economy.

Report finds dramatic reductions in prohibited logging activities around the globe.

A modern dairy tale.

Artists give Rio community a radiant makeover.

Progressive regulations will eliminate most fast food packaging from the landfill.

Clever urban hack created by young L.A. duo encourages people to replant their neighborhoods.

From melting ice caps to volcanic hot springs, Roni Horn's art is inspired by Iceland's shifting landscape.

Canadian environmentalist David Suzuki offers his take on the greenness of the games.