In all fairness, pollution is the problem, In China today in most industrial areas , air pollution looks like fog. And it is heat trapping smog.   So we call it Carbon.  
Canada has a serious problem with forest fires, too often overlooked.  And those fires are heat trapping as well.     Canada seriously needs  aircraft to combat those fires.   Harper saw it, so did many scientists.  Taxing Canadians will not address the problem, 
Water transporting aircraft will.