As for the methane/sinks discussion, I see your point, and perhaps we should separate processes beyond our control. So cutting down a forest=bad. Planting a forest=good. There is a net CO2 benefit by not cutting down forests, but there is also an economic impact for making that decision. The same as their is for leaving oil in the ground. Trees and oil are both resources, and both affect the CO2 balance.
Heck, they just discovered global Hydro reservoirs are a bigger source of CO2 emmisions than all of Canada. So, for instance, should the site C dam get a free ride? So you see, I'm saying we need to look at all aspects, see what the net changes are and approach them accordingly.
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