Increasing
CO2 concentrations
¥How
high will they go?
How warm will it get???
¥If
CO2 concentrations stay within factor of 2
of pre-industrial, then warming of 3+1oC
is expected
¥If
concentrations go still higher => larger uncertainty because the climate is moving into
unprecedented territory
Last 4 Ice Age cycles:
400,000 years
Man made
You are
here
Ice age CO2 range
You are going to be
somewhere in here
See http://epa.gov/climatechange/science/futureac.html