The Intergovernmental Panel on Climate Change (IPCC) claim of human-caused global warming (AGW) is built on the assumption that an increase in atmospheric CO2 causes an increase in global temperature. The IPCC claim is what science calls a theory, a hypothesis, or in simple English, a speculation. Every theory is based on a set of … Fortsett å lese Tim Ball: The Evidence Proves That CO2 Is Not A Greenhouse Gas.