SA Special Editions

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?

Preserving biodiversity in rich habitats is good. But global warming and other new threats may call for a new strategy

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

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?

Massive developments proposed for the U.S., China and Abu Dhabi aim to reduce or even eliminate the environmental cost of city living

Cultivating crops in downtown skyscrapers might save bushels of energy and provide city dwellers with distinctively fresh food