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The U.S. stores emergency water for Mexico at Lake Mead, the reservoir behind Hoover Dam near Las Vegas.

U.S. and Mexican commissioners have signed an amendment to a 1944 treaty, which allocates water from the Colorado River to Mexico.

Biologists Laura Herren and Brian Lapointe bag red sea grass at Shorty's Pocket, a site in the Indian River lagoon. Manatees have died from eating the toxic macro algae.

With Murky Water And Manatee Deaths, Lagoon Languishes

Something is wrong in Florida's Indian River Lagoon.

San Diego Water Authority Enters High-Stakes Water Fight

A trial beginning Tuesday in San Francisco will test the San Diego County Water Authority's claim that the region's 3.1 million residents are subsidizing nearly all the rest of Southern California.

Citing continued signs of weakness, the Federal Reserve said it will keep aiming for low interest rates.

Why The Fed Decided Not To Change Course

Gas prices are down more than 7 percent from last year. Grocery costs haven't budged lately. And -- just in time for Halloween -- the price of candy is down 2.3 percent from last year, according to the government's consumer price index released Wednesday.

Vegetation like the kind growing here at Michigan State University's Kellogg Biological Station could one day be used to feed small biofuel refineries spread throughout the Midwest.

Could Some Midwest Land Support New Biofuel Refineries?

Land that isn't in good enough condition to grow crops could be used to produce substantial amounts of liquid biofuels, a new study claims. But there are many concerns about the study, and about the future of advanced biofuels in the U.S. and abroad.

This map shows the potential biomass collection within 10 states. Each circle represents an area of about 7,800 square miles, which could produce about 23 million gallons of ethanol per year. A gigagram, or Gg, is about 1,100 tons.

Could Some Midwest Land Support New Biofuel Refineries?

Millions of acres of marginal farmland in the Midwest -- land that isn't in good enough condition to grow crops -- could be used to produce liquid fuels made from plant material, according to a study in Nature. And those biofuels could, in theory, provide about 25 percent of the advanced biofuels required by a 2007 federal law.

The community of Greensburg, Kan., was hit hard by an F5 tornado in 2007. The event inspired one resident to run for mayor.

Kansas Mayor Says Sustainability Is About Community, Not Politics

Today's political polarization makes it seem harder than ever to tackle climate change. Republican Bob Dixson says the goals of going green aren't only for liberals. His town of Greensburg was hit by an unusually strong tornado, and now he's working on a White House task force to prepare communities like his.

July 22, 2012: In Baltimore, John Rose tried to keep cool during one of the year's heat waves.

It's In The Books: 2012 Was Warmest Year On Record For Lower 48 States

Last year "marked the warmest year on record for the contiguous United States," the National Climatic Data Center just confirmed.

Snow clings to flowers in Denver on Wednesday. As much as a foot of snow is forecast for some areas of Colorado.

Snow In May? The Nation's Midsection Bundles Up

It's a good thing Punxsutawney Phil's handler admitted he'd misinterpreted the early spring forecast from the world-famous groundhog weather prognosticator. The National Weather Service issued a winter storm warning Wednesday for parts of Colorado. It says the heavy snow that has blanketed swaths of the Rocky Mountains is moving east:

San Diego Farm Bureau Chief Eric Larson said dry conditions mean farmers will have to use more water, which will raise their costs and cut into their profits.

San Diego Farmers Bracing For A Tough Year

San Diego farmers are facing a triple threat: rainfall is three inches below average, water prices have skyrocketed, and the state’s snowpack is 52 percent of normal.

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