There is no climate change outside of the normal four seasons and the variation that can occur. So we would be spending billions or trillions of dollars over decades in a wild goose chase. The IPCC report on climate change has already been discredited. The Arctic ice is thicker than normally seen. Polar bears are thriving and growing in number. Remember, the "Chicken Little" climate change activists were sounding an alarm in the 1970's that a mini-Ice Age was coming (Time magazine, Jun 1974).