In 1997, GISS showed 0.8ºC warming in the Northern Hemisphere from 1885 to 1940 – when CO2 was 310 PPM. Over the next 45 years, only 0.2ºC additional warming has occurred.
Archived here : http://www.giss.nasa.gov/Data/GISTEMP/ZonAnn.Ts.txt
No wonder Hansen decided to rewrite history. There is no CO2 footprint in the actual temperature record.