Toronto Star: Most Canadians tell pollsters they’re concerned about climate change. Many insist they’d like to do something about it, and would even pay for measures to reduce greenhouse gas emissions. But propose actual cash amounts – 25 cents a litre on gasoline, perhaps, or a $10 daily commuter toll – and support evaporates. "Once you put a price on it, people tend to think twice about it and say, `Maybe not,’" says Mario Canseco of Angus Reid Strategies, which surveyed about …