No, I think you should look at both. I think if you look at the costs of urban air pollution, for example—and I'll let my colleagues who have an equally strong case to be made on climate change, on greenhouse gases—it's a no-brainer if you look at the costs of urban air pollution.
What's the cost of a human life? While 16,000 people prematurely die from air pollution in Canada every year, who's bearing the cost of that? Who bears the personal cost of that, and who bears the health care cost of that? Well, we do. What's the cost of an asthma attack? What's the cost of increased respiratory illnesses?
I think costs are extremely relevant to this debate.