Sorry, I don't have any hard and fast answers to that. I don't think there is any doubt that mankind is responsible for some of the damage, like erosion and pollution but whether it's 10% or 90% I really can't tell. There could be factors that most of us haven't even thought of. And then there's a question of which are temporary and which are permanent.I guess you have an exact idea on how much a contribution it makes? Everything I have seen is all just theories and conjecture and of course "climate religion". Just because the CBC says it's so doesn't mean it is.