Carbon dioxide increase
(This graph is from IPCC 2001, "Climate Change 2001: The Scientific Basis", chapter 2)
This graph shows the increase in the atmospheric concentration of Carbon dioxide (CO2), methane (CH4) and Antarctic temperature from 420,000 years ago until prior to the industrial revolution.

The grey color represents CO2 concentrations, and the scale on the far left refers to the CO2 values. As can be seen in the graph to the left, pre-industrial levels (~280 ppmv) were similar to previous interglacials (times which were not considered an 'ice-age' - as now). The present, post-industrial atmospheric level of CO2 concentration is around 370ppmv, which on this graph would be off the scale.

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