Regardless of whether you believe that climate change is caused by humans, it seems a prudent step to reduce CO2 emissions as we know that CO2 traps heat within the atmosphere.  There is absolutely no dispute that this is true, it is VERY simple physics that can be demonstrated in the lab. Even if the cause is natural, why compound the problem by continuing to release CO2?  There is also an argument to reduce CO2 emissions on purely environments grounds.  These emissions are largely from the burning of fossil fuels which produce other environmental toxins, such a mercury.  We have seen huge spikes in the amount of mercury in our arctic wildlife in the last 20 years or so as the Chinese construction of power plans has spiked and their use of high sulfur coals has been documented.