Suppose that you live in Vancouver and you drive a car to work. Naturally, you have to get gas regularly. When you stop at the pump, you may see a notice like the one above, explaining that part of the price you're paying is, in effect, due to the cost of carbon. That's because in 2008, the government of British Columbia decided to impose a tax on greenhouse gas emissions from fossil fuels, enacting what has been called "the most significant carbon tax in the Western Hemisphere by far."
A carbon tax is just what it sounds like: The B.C. government levies a fee, currently 30 Canadian dollars, for every metric ton of carbon dioxide equivalent emissions resulting from the burning of various fuels, including gasoline, diesel, natural gas, and, of course, coal. That amount is then included in the price you pay at the pump -- for gasoline, it's 6.67 cents per liter (about 25 cents per gallon) -- or on your home heating bill, or wherever else the tax applies. (Most monetary amounts in this piece will be in Canadian dollars, which are currently worth about 89 American cents.)
If the goal was to reduce global warming pollution, then the B.C. carbon tax totally works. Since its passage, gasoline use in British Columbia has plummeted, declining seven times as much as might be expected from an equivalent rise in the market price of gas, according to a recent study by two researchers at the University of Ottawa. That's apparently because the tax hasn't just had an economic effect: It has also helped change the culture of energy use in B.C. "I think it really increased the awareness about climate change and the need for carbon reduction, just because it was a daily, weekly thing that you saw," says Merran Smith, the head of Clean Energy Canada. "It made climate action real to people."