Because he can't account for anything else that would cause the 1977 - 1997 rise in temperatures and since there is a good correlation
during that time period to CO2 he must entirely rest his case on CO2 (as do
most AGW enthusiasts) on the presumption that the 20
year period between 1977 - 1997 proves the
importance and sensitivity
of CO2.
The prevalence, stability and long - term consequences
of these problems have highlighted the
importance of intervening to address them
during the early
years, when behavioural patterns are
most easily modified (Tremblay 2006; Kaminski 2008).