Global Warming: Human Influence
“Our ability to quantify the human influence on global climate is currently limited because the expected signal is still emerging from the noise of natural variability…’” – 1995 IPPC Summary, cited by 2001 EPA global warming web site
“In the light of new evidence . . . most of the observed warming over the last 50 years is likely to have been due to the increase in greenhouse gas concentrations.” – 2001 IPCC Summary