As green as it gets: "Living Lab" for clean tech companies unveiled in Holland.

Sustainable energy transforms lives in rural Kenya.

Computer-generated fantasy worlds "recycled" from famous artworks.

Isabelle Cossart accidently joins the local food movement.

Economic recession blamed for decline.

Artists give Rio community a radiant makeover.

On Earth Day 's 40th anniversary, John Kerry warns that climate change is the environment's biggest hurdle yet.

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