claim: The minute increase of anthropogenic CO2 in the atmosphere ( 0.008% ) was not the cause of the warming—it was a continuation of natural cycles that occurred over the past 500 years.
evidence: The sharp acceleration in CO 2 emissions since 2000 to more than a 3% increase per year ( more than 2 ppm per year ) from 1.1% per year during the 1990s is attributable to the lapse of formerly declining trends in carbon intensity of both developing and developed nations.