¥CO2 levels are rising and will likely double
relative to pre-industrial levels by 2070.
¥The
greenhouse relationship between higher CO2 levels
and warmer temperatures is indisputable.
¥Even with
perfect knowledge of future CO2 levels, there
is significant uncertainty about how much warming
would occur and how fast it would occur.
¥Model results
indicate a 1.5 to 4.5oC global warming, with
strongest warming in polar regions, and an overall
increase in global precipitation.
¥Shifts
in precipitation are much more uncertain.