TORONTO — The federal government will end up with the power to regulate almost every facet of life — such as when you can drive or where you can live — if its law aimed at curbing harmful greenhouse gas emissions is allowed to stand, Ontario’s top court heard Monday.

Ottawa’s climate-change law is so broad, a lawyer for the province told the start of a four-day Appeal Court hearing, that it would give the federal government powers that would be destabilizing to Canada in the name of curbing the cumulative effects of global-warming emissions.

“They could regulate where you live. How often you drive your car,” Josh Hunter told the five-justice panel. “It would unbalance the federation.”