"Critics have pointed to the inconsistency as a flaw in scientists' theories of climate change. Scientists have argued that today's global climate change has been caused in part by buildup of CO2 in the atmosphere resulting from fossil fuel emissions.
But, critics have countered, if CO2 truly raises global temperatures, how could an ice age have occurred when a greenhouse effect much greater than today's was in full swing?
The answer: This particular ice age didn't begin when CO2 was at its peak -- it began 10 million years earlier, when CO2 levels were at a low.
'Our results are consistent with the notion that CO2 concentrations drive climate.'"
According to some other peer-reviewed reports we don't have much time left to do something about it.