A Polish architecture firm's visionary concept for a net-zero skyscraper.

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

Prefab with near-zero eco-footprint is the perfect retreat for Oregon nature writer.

Global forest loss slowed over the past decade, with less logging in the Amazon and widespread tree planting in China.

New technologies offer promise for expensive process of making saltwater fresh.

(Without the food coloring.)

Condoms for a cause.

Beleagured Toyota president faces the music...sort of.