Are Hotspots the Key to Conservation
Preserving biodiversity in rich habitats is good. But global warming and other new threats may call for a new strategy
Catch-22: Water vs. Energy
Water 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 Oil
Former CIA director, R. James Woolsey, says America's oil dependence is a grave threat
Constructing buildings to the LEED standard can conserve energy and materials-or be exploited for promotional gain
Beyond the Tipping point
The 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?
Cultivating crops in downtown skyscrapers might save bushels of energy and provide city dwellers with distinctively fresh food
Eco-Cities of the Future
Massive developments proposed for the U.S., China and Abu Dhabi aim to reduce or even eliminate the environmental cost of city living