San Jose Mercury News: Over the last year, the scientific consensus on global warming has gone from highly probable to unequivocal. In less than a century we may double the amount of carbon in our atmosphere. No scientist or climate model can predict the exact consequences but we do know one thing: Our current path is a high-risk, uncontrolled experiment on the only home we have. California has become a national leader on reducing electrical consumption, saving families money while reducing our carbon …