SV: Humans causing Global warming > evidence increases

This is actually quite incorrect. The geological record shows that we
have been in an unusually low CO2 environment for the last 2 million
years or so. Evidence from fosillized sea shells indicate that the CO2
was much higher for very long periods of time. In fact we seem to be
in one of the geologically short (2 - 10 million years) of unusually
low levels of atmospheric CO2.