Boston Globe: Governor Deval Patrick has signed a bill that would sharply curb greenhouse gas emissions in the state. The Global Warming Solutions Act requires the emissions — which scientists say are causing global warming that could wreak havoc on the world’s environment — to be reduced by as much as 25 percent from 1990 levels by 2020. It also calls for a reduction of 80 percent by 2050. The bill would include tough penalties, with fines of as much as $25,000 a day for …