The issue is not that climate change can have deleterious or beneficial effects, it it whether humans actually cause climate change. There is a large body of scientists who believe that climate change is driven by solar activity and cyclic planetary behavior. It has been demonstrated that the computer models that forecast climate change are unable to predict measured earth temperatures accurately. If we believed “An Inconvenient Truth”, ocean levels would be a foot higher by now. Incidentally, there is evidence that CO2 has been responsible for the greening of the planet.