Federal-versus-provincial powers take centre stage in Ontario carbon tax court battle

"Public health is both the responsibility and the prerogative of the federal government because in the case of climate change, we're dealing with a condition that does not respect provincial boundaries," said intervener Ian Culbert, the executive director of the Canadian Public Health Association. "So if one jurisdiction is not pulling its fair share, as far as taking action on climate change, citizens in other parts of the country will pay the price."