There's a lot of noise made by those whose ox is going to get gored by getting serious about the climate. There's no scientific debate other than in the size of the debacle. (For example, methane hydrate--it's not included in the IPCC reports at all because our estimates are still too wide. Note that on the high end it's *worse* than the high end estimates for the effects of CO2--and they will add. Earth has seen that kind of temperature before--most of the rocks laid down at that time don't have fossils.)