REGINA — Saskatchewan’s attorney general says he has no doubt the constitutional challenge against Ottawa’s imposition of carbon tax will end up in the Supreme Court of Canada.Don Morgan says his government will respect the ruling from the provincial Appeal Court, which will hear two days of arguments starting Wednesday.But he says other provinces will look carefully at what is decided and could take the matter further.Morgan says he agrees climate change is a national concern, but believes Ottawa should be working to find other ways to mitigate emissions.The Saskatchewan Party government argues a federally imposed carbon tax is unconstitutional because it will not apply evenly across all of the provinces.Ottawa says it has the authority under the Constitution to put a price on pollution because climate change is a national concern.The federal government’s carbon tax is set to take effect in Saskatchewan, New Brunswick, Ontario and Manitoba starting in April.The Canadian Press