The Keeling CurveKeeling (1960) observed: “at the South Pole the observed rate of increase is nearly that to be expected from the combustion of fossil fuel.”

C. D. Keeling, The Concentration and Isotopic Abundances of Carbon Dioxide in the Atmosphere, Tellus, 12, 200-203, 1960

Source: wikipedia

65 million yearsPaleocene–Eocene Thermal Maximum (PETM) ΔT=6°C in 20,000:

we are projected to get ΔT=4°C in 100 years

Reconstructing CO2 and

Temperature 2 million year

Hönisch et al., (2009) Science 324pp. 1551 - 1554

Globigerinoides sacculifer

δ18O

δ11B

Air-trapped in Ice Bubbles (PCO2 and T)

Luthi et al. Nature (2008)

390

Sampling for the 2000 year record

2000 yearsof climate

Mann et al. (2008) PNAS 105: 13252-13257

Including: tree-ring, marine sediment, speleothem, lacustrine, ice core, coral, and historical documentary series