The California rule is stricter than a federal rule adopted this year that tightens emissions standards but does not require sales of electric vehicles.
US president-elect Donald Trump has again fired a broadside at the country’s northern neighbours, saying he believed making Canada the 51st state was a “great idea”.
Doug Ford told CNN that cutting off energy exports to the U.S. remained 'a tool that we have in our toolbox' to retaliate against Donald Trump's threat of tariffs.