Share 'Reforesting is a good idea, but it is necessary to know where and how'

Is planting trees in naturally open canopy areas such as the savanna needed to absorb mankind's "unnatural" CO2 emissions or is it mere disregard for the law of unintended consequences? Alternately, would simply letting forests do what forests do best be more sensible? If the latter is pursued and a naturally heavily forested place like northern New England alters its use of forests to heighten c…