Original: IPCC Third Assessment Report: Climate Change 2001 The Third Assessment Report (TAR) consists of four reports, three of them from its working groups: Working Group I: The Scientific BasisWorking Group 1, IPCC.
Simplified: IPCC Third Assessment Report: Climate Change 2001 The Third Assessment Report (TAR) contains four reports, three of them from its working groups: Working Group 1: The Scientific BasisWorking Group 1, IPCC.