Christian Science Monitor: Taxing carbon-spewing machines to slow global warming certainly has an eat-your-peas aspect to it: "Trade your SUV for a hybrid or we’ll make you pay!" Then again, tax policy can have a huge and positive impact on individual and group behavior. In part, high cigarette taxes explain why rates of smoking among Americans have plummeted. The Canadian province of British Columbia last week became the first jurisdiction in North America to enact a consumer-based tax on …