claim: So that means that probably about half, maybe half of that nine-tenths of the degree [of total warming] might be caused by greenhouse gases
evidence: The Intergovernmental Panel on Climate Change said the likelihood was 90 percent to 99 percent that emissions of heat-trapping greenhouse gases like carbon dioxide, spewed from tailpipes and smokestacks, were the dominant cause of the observed warming of the last 50 years.
category: Scientific consensus on climate change