a) atmospheric CO2 from human activity is a major bause of observed warming in the 1980's and 1990's, c) that warming is overstated due to a number of factors including solar effects and measurement
skew d) the
data going back 150 years is of little reliability because it is clustered so heavily in northeast america and western europe rather than being
global e) the
global climate has been significantly shifting over the last thousand years, over the last ten thousand years, and over the last hundred thousand years; atmospheric CO2 levels did not drive those changes, and some of them were rapid.