Are Hotspots the Key to ConservationPreserving biodiversity in rich habitats is good. But global warming and other new threats may call for a new strategy
Catch-22: Water vs. EnergyWater is needed to generate energy. Energy is needed to deliver water. Both resources are limiting the other—and both may be running short. Is there a way out?
For Security, Get Off OilFormer CIA director, R. James Woolsey, says America's oil dependence is a grave threat
Mis LEEDing?Constructing buildings to the LEED standard can conserve energy and materials-or be exploited for promotional gain
Beyond the Tipping pointThe world's most outspoken climatologist argues that today's carbon dioxide levels are already dangerously too high. What can we do if he is right?
Growing VerticalCultivating crops in downtown skyscrapers might save bushels of energy and provide city dwellers with distinctively fresh food
Eco-Cities of the FutureMassive developments proposed for the U.S., China and Abu Dhabi aim to reduce or even eliminate the environmental cost of city living
Florida's Garbage Vaporized
China Targets Cleaner Coal
Dark Horse: Oil from Algae
Biofuels or Food?
Jack Johnson's Low-Impact Tour
Preserving Forests and Business
One Last Chance to Lead
Learning from the Internet
Alexandra Cousteau Wades In
2,000,000 plastic bottles are discarded in the U.S. every five minutes
The Other CO2 Problem
Plastics in Our Diet
United under 1Sky
Green Jobs, Not Jails
Green Funds Remain Hot
From the Editor