The Intergovernmental Panel on Climate Change (IPCC) has successfully produced four assessment reports since 1990 along with a number of special reports and greenhouse gas inventory guidelines. It has very rigorous and robust procedures and guidelines for preparing the assessment
reports largely based on synthesis of peer-reviewed and published scientific literature. IPCC has attracted controversy since the Second Assessment Report of 1995. The recent controversies surrounding the IPCC reports surfaced nearly two years after the release of the report in 2007, especially in the wake of the crucial Copenhagen Climate Convention. Many of the controversies can be traced to the use of information sourced from reports published outside the scientific journals such as reports of the World Wildlife Fund. It is true that there are a few errors in the IPCC reports, which may have escaped the multilayered rigorous review process. Many of the errors found in the
main reports, which are over a thousand page each, have not been quoted in the crucial and most referred Summary for Policy Makers. IPCC may have to develop a more robust policy for sourcing literature published outside the scientific journals. The United Nations Secretary General has
requested the prestigious Inter-Academy Council to review the IPCC principles, procedures and guidelines. The controversies raised in the recent past do not in any way change the main conclusions of the IPCC Assessment Report.