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AP Wire %7C 08%2F16%2F2004 %7C Study%3A Global warming brings extreme changes to California: "SACRAMENTO - Global warming will cause a dramatic increase in extreme summer heat and a depleted winter snow pack that will have severe effects on California%27s water and power supplies%2C 19 U.S. scientists reported Monday in a prestigious scientific journal.%0D%0AThe report is substantially more pessimistic than previous projections."