San Francisco Chronicle: California has been hit by 2,000 fires this year, and climate scientists are predicting that the situation will worsen as temperatures rise. The American West has been warming dramatically during the past 60 years at a rate surpassed only by Alaska. This year has been particularly dry for California, with less snowfall, earlier snowmelt and lower summer river flows. Some of the state’s top scientists say the changing water picture is caused by humans producing greenhouse gases, …