...detrimental. The most recent report of the Intergovernmental Panel on Climate Change (IPCC) concluded that: "Our ability to quantify the human Influence on global...are uncertainties In key factors. These Include the magnitudes and patterns of long-term variability the time-evolving partem of forcing by. and response...

...of Evidence on Climate Change "Our ability to quantify the human influence on global climate change is currently limited because the expected signal is...and patterns of long term natural variability and time-evolving patterns of forcing by, and response to, changes in concentrations of greenhouse gases...

...climate change, concluded that: Our ability to quantify the human influence on global climate is cumntly limited because the expected signal is still emerging...are uncertainties in key factors, These include the magnitudes and patterns of long-term variability and the time-evolving pattern of forcing by. and response...