Good point. Water is the crucial factor here in afforestation as a greenhouse gas, though eventually the moisture will evaporate and form clouds which they rev

Good point. Water is the crucial factor here in afforestation as a greenhouse gas, though eventually the moisture will evaporate and form clouds which they reverse their effect, and a tree trunk can hold carbon for a very long time. So I'm not sold that tree planting has as negligible effect as the original poster claims.