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Some of the most advanced climate models show global warming hurting agricultural production in the world's poorest regions. But Cynthia Rosenzweig, a NASA scientist who's studied this question for 20 years, has faith that solutions are within reach.

Sen. John McCain unveils his proposed energy policy Tuesday. The presumptive Republican presidential nominee argues the United States should lift its ban on offshore drilling.

Independent groups have yet to unveil an ad as damaging as the Swift Boat Veterans spot that hurt Sen. John Kerry's presidential bid in 2004. But as the summer goes on, more groups are producing radio and TV spots targeting the presidential race and key Senate battles.

President Obama's tougher new fuel efficiency standards bring industry, environmentalists and states together to start cutting greenhouse gas emissions from cars. But the reductions would represent only a drop in the bucket of what's needed to address global warming.

Amid prospects of a prolonged economic downturn, startup companies are having far more trouble finding cash. In the first three quarters of 2008, only six venture-backed companies held initial public offerings, compared with 86 IPOs in 2007.

With dangerously high temperatures across the country, hospitals are seeing more people with potentially deadly heat illness. A southern city is coping with what may be the new summer medical reality.

The Justice Department is suing Texas over floating border barriers installed by the state in the Rio Grande River to block migrants crossing from Mexico. We get an update from Eagle Pass, Texas.

Maxim Loskutoff's collection of short stories picks at the tensions between city and country among everyday Westerners — who find themselves living among heavily-armed separatist militias.

In The Overstory, Powers explores how humans can revere ancient trees with "the same kind of sanctity that we reserve exclusively for ourselves."

The White House wants to direct more funding communities dealing with high levels of pollution and health problems. But how agencies determine who qualifies for the money has some researchers worried.