Without serious reduction in emissions:
California will become significantly hotter and drier by the end of the century, causing severe air pollution, a drop in the water supply, melting of 90 percent of the Sierra snowpack and up to six times more heat-related deaths in major urban centers, according to a sweeping study compiled with help from respected scientists from around the country.
The weather -- up to 10.5 degrees warmer by 2100 -- would make last month's heat wave look average. If industrial and vehicle emissions continue unabated, there could be up to 100 more days a year when temperatures hit 90 degrees or above in Los Angeles and 95 degrees or above in Sacramento. Both cities have about 20 days of such extreme heat now.