A simple carbon tax, no exemptions for hydro, LNG, agriculture or whatever else the government of the day wants to support seems to be the ticket. Start at $30 and increase slowly until GHG are down about 70%. Or, for climate change sceptics, tie the price to the temperature trend over the past three decades. Preferably revenue neutral but that would up to the jurisdiction. Some form of relief for the poorest people who will be hurt by this. Preferably a minimum guaranteed income but again, up to the jurisdiction to find the best way to do this for its population and economy.