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  • U.S. and Mexican commissioners have signed an amendment to a 1944 treaty, which allocates water from the Colorado River to Mexico.
  • President Obama is expected to announce a sweeping plan to address climate change this afternoon.
  • 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.
  • Something is wrong in Florida's Indian River Lagoon.
  • A study finds there may be a way to boost some of the beneficial compounds in plants by simulating the light-dark cycle after crops are harvested. Plants use circadian rhythms to help them judge when to turn on their chemical defenses.
  • 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.
  • The first heavy rains of the season fell two weeks ago at Salt Point State Park, on the northern California coast, and now ranger Todd Farcau is waiting anxiously for the forest floor to erupt with mushrooms.
  • 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.
  • A widespread drought is killing the livelihoods of pastoral nomads in the region known as the Horn of Africa. Cows, goats and other livestock have all died due to the water shortage. The devastation poses the question of whether the lifestyle of pastoralists -- who move between Somalia, Kenya and Ethiopia foraging for food and water for their herds -- can be sustained.
  • Reinforcements are flowing into drought-ravaged Texas as it battles two dozen wildfires burning across the state. The fires have razed 1.8 million acres so far and destroyed hundreds of homes. On Thursday, Gov. Rick Perry even officially declared Easter weekend to be three "Days of Prayer for Rain."
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