Yeah things are not as simple as it seems. I read a study on irrigation of the Sahara to grow forests, but the change in albedo (reflectivity) from desert sand

Yeah things are not as simple as it seems. I read a study on irrigation of the Sahara to grow forests, but the change in albedo (reflectivity) from desert sand to dark forest would counteract the benefit of the carbon sequestration and lead to a net temperature increase. I imagine the same holds true for northern areas because snow and ice are extremely reflective. The methane release is just icing on the metaphorical shit cake.