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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.

Drought and famine has left children in Somali dying and displaced millions. San Diego is home to the second largest population of Somali refugees in the U.S., we'll hear about how they're working to get aid to the county.

The African Union hopes to raise funds and awareness of the drought and famine in the Horn of Africa, especially in Somalia, with a "pledging conference" Thursday. The U.N. is appealing for more than $1.5 billion in donations, as refugees from the war-ravaged country continue to stream into Kenya.

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

Firefighters were chasing early-morning flare-ups Friday in a damaging wildfire that was largely tamed but kept thousands of people from their homes in the foothill suburbs northeast of Los Angeles.

With 15,000 firefighters deployed and three dozen major wildfires currently burning in five Western states, this would seem to be a wildfire season for the record books. And in one tragic aspect, it is. But by most measures, 2013 is the second-mildest fire season in the past decade ... so far.

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.

Something is wrong in Florida's Indian River Lagoon.

Years of drought and water supply shortages have led to permanent water restrictions in the city of San Diego.

"We've had time to act — and essentially we haven't acted," says science journalist Michael Lemonick. He describes the threats posed by climate change in his new book, Global Weirdness: Severe Storms, Deadly Heat Waves, Relentless Drought, Rising Seas, and the Weather of the Future.