claim: In other words, there is as yet no incontrovertible  proof either of the greenhouse effect, or its connection with alleged  global warming.
evidence: "Robust findings" of the Synthesis report include: "Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice and rising global average sea level".
category: Intergovernmental Panel on Climate Change