  Air-conditioning has transformed summer living but at tremendous energy cost. Here are seven ideas for smarter cooling.
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 | � | The "extraordinary recovery" of a Mexican marine reserve makes it Earth's most robust, experts say. |
 | � | New York's Adirondack Park is blessedly remote, divinely beautiful, and unbelievably complicated. |
 | � | Discover depths few have witnessed gallery of underwater explorers on the move. |
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 | � | Discover the variety of animals, from muskrats to manatees, that inhabit wetlands, lakes, and rivers. |
 | � | See refreshing shots of the world's most diverse sources of water. | | 
 | � | With the sun nearing the high point in its 11-year activity cycle, grid operators are seeking to protect a vulnerable power-delivery system. |
 | � | To make much needed fresh water, just de-salt saltwater? Experts weigh in on what needs to be done to make it as easy as it sounds. |
 | � | The company captures U.S. government's L Prize with its LED replacement for the 60-watt bulb�but can it win consumers' hearts? | |  | 
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