Global Warming


Estimated changes in annual global mean temperatures and carbon dioxide concentrations over the past 137 years

relative to a 1961-90 base period.

Temperature data (deg C) go through 1996 (red line)

Carbon dioxide values are from ice cores until 1956 (blue dashed line) and from air sampling at Mauna Loa, Hawaii from 1957 through 1995 (blue solid line).