Toronto Star: Prime Minister Justin Trudeau knows it. Most Canadians know it. And Ontarios Kathleen Wynne and most of the premiers know it. We need to put a serious price on carbon to do our bit to keep the Earth from getting too warm, and inflicting havoc on much of the planet in the form of melting ice caps, freakish weather, heat waves, droughts and floods. So its discouraging that Trudeau and the premiers could not agree at their get-together in Vancouver this past week on a pan-Canadian framework to...