Sustainability

By displacing agriculture for food—and causing more land clearing—biofuels are bad for hungry people and the environment

From liquid coal to biofuels, military and commercial aviators are searching for domestically sourced, cost-effective and clean alternatives to petroleum-derived jet fuel

Maybe it's just easier because they're putting it out on the curb rather than finding on-campus recycling centers, but moms are more earth-friendly than their kids at college. Karen Hopkin reports.

Amyris Biotechnologies (Emeryville, Calif.)

Three years ago, experts and officials called for a green revolution in African agriculture. They are beginning to get their wish.

An international panel of experts recommends fixes for the world's energy—and climate—crises

Changes to agricultural practice and forestry management could cut greenhouse gas emissions, buying time to develop alternative technologies

Existing U.S. power plants could provide enough juice to switch 84 percent of the 220 million American vehicles on the road from gasoline to electricity.