Globe and Mail: During the 2006 campaign, Conservative Leader Stephen Harper stood in front of a bus in Vancouver for one of those photo-ops that television networks find irresistible. There, he announced a policy to combat climate change: a tax credit for those with public transit passes. More people riding public transit would mean fewer people using cars, which, in turn, would reduce greenhouse gas emissions, he declared. It was a farcical policy, not to put too fine a point on the matter. …