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Two top intelligence officials have testified in Congress about the implications of climate change for U.S. national security. They discussed an assessment that identifies parts of the world where climate change could produce political instability.

In Florida, Lake Okeechobee's water level dropped enough that dry grasses on the lake floor caught fire. But the weather isn't the only reason for the state's water woes, the author of a new book says.

What's in bloom at the Anza-Borrego Desert? A park ranger joins the show to talk about the flora and fauna of the region.

San Diego County residents have responded to the call to conserve water, and local water district now say they'll ease back on water-use restrictions for the winter. How will the water-use restrictions change because of local conservation efforts? And, could local efforts to conserve lead to higher water rates in the future?

Got milk? China does. In just eight years, consumption of milk has almost tripled. New wealth and new dining habits among China's burgeoning middle class is driving that growth — which is helping to drive up dairy prices around the world.

Food riots last week in Haiti resulted in seven deaths — and in the prime minister's ouster. These events grimly illustrate how the rising cost of commodities threatens to deepen instability in the hemisphere's poorest country.

Seated behind the wheel of a fire engine, Dave Breglia follows a map dotted with expensive homes threatened by wildfires. His job: protect high-end real estate and save an insurance company millions o

The U.S. and Europe head toward a compromise solution as the U.N. climate conference at Bali winds down. An agreement would break a deadlock over how ambitious the goal should be in negotiating future cutbacks in global warming gases.

Millions of Americans have moved to the suburbs over the past 60 years. They gain a bigger house, but until recently, few were aware of the impact those choices had on the environment.

Washington is pressuring Yemen to get tougher on militants, including those involved in the 2000 bombing of the USS Cole. Yemeni officials say the government isn't strong enough to defeat the extremists militarily, and warn that America's hard stance could backfire.