'Unplugged Nation' takes city folk off the grid

Exxon knew climate risks in 1981, email suggests

Scientists create engine that is powered entirely by evaporation

Big utilities are ready to go small

With Solar Energy Research Center, we're one step closer to making fuel from sunlight and CO2

Are the Mekong River dams double-edged swords?

5 dangers of oil drilling in the Arctic Ocean

Philips' latest bright idea is a no-frills $5 LED bulb

Battling climate change requires actions big and small

Cities around the world to dim lights for Earth Hour

Bright and stormy night: Clouds make cities lighter

Bionic leaf can convert solar energy into liquid fuel