claim: Once natural influences, in particular the impact of El Nino and La Nina, are removed from the recent termperature record, there is no evidence of a significant change in the human contribution to climate change.
evidence: The introduction includes this statement : There is strong evidence that the warming of the Earth over the last half-century has been caused largely by human activity, such as the burning of fossil fuels and changes in land use, including agriculture and deforestation.