Written responses from U.S. coordinating and lead scientific authors to the committee indicate, however, that (a) no changes were made without the consent of the convening lead authors (this group represents a fraction of the lead and contributing authors) and (b) most changes that did occur lacked significant impact.The Third Assessment Report (TAR) was completed in 2001 and consists of four reports, three of them from its Working Groups:Review comments are in an open archive for at least five years.Various scientific bodies have issued official statements endorsing and concurring with the findings of the IPCC.There are several major groups:The IPCC was tasked with reviewing peer-reviewed scientific literature and other relevant publications to provide information on the state of knowledge about climate change.The major conclusion was that research since 1990 did "not affect our fundamental understanding of the science of the greenhouse effect and either confirm or do not justify alteration of the major conclusions of the first IPCC scientific assessment".

It produces comprehensive assessments, reports on special topics, and methodologies. The preparation and approval process for all IPCC Special Reports follows the same procedures as for IPCC Assessment Reports. It noted that transient (time-dependent) simulations, which had been very preliminary in the FAR, were now improved, but did not include aerosol or ozone changes. Intergovernmental Panel on Climate Change (IPCC) is an international body for the assessment of climate change. The IPCC prepares comprehensive Assessment Reports about knowledge on climate change, its causes, potential impacts and response options.

In addition to climate assessment reports, the IPCC publishes Special Reports on specific topics. The choice of authors aims for a range of views, expertise and geographical representation, ensuring representation of experts from developing and developed countries and countries with economies in transition.The IPCC also often answers inquiries from the UNFCCC Subsidiary Body for Scientific and Technological Advice (SBSTA).

For example, the wording of the reports from the first to the fifth assessment reflects the growing evidence for a changing climate caused by human activity.A paragraph in the 2007 Working Group II report ("Impacts, Adaptation and Vulnerability"), chapter 10 included a projection that Himalayan glaciers could disappear by 2035Each of the last three parts was completed by a separate Working Group (WG), and each has a Summary for Policymakers (SPM) that represents a consensus of national representatives.

The IPCC prepares comprehensive Assessment Reports about the state of scientific, technical and socio-economic knowledge on climate change, its impacts and future risks, and options for reducing the rate at which climate change is taking place. The IPCC also produces Special Reports, which are an assessment on a specific issue and Methodology Reports, which provide practical guidelines for the preparation of greenhouse gas inventories. The WCRP sensitivity estimate is designed to be used by the United Nations’s Intergovernmental Panel on Climate Change (IPCC) when it publishes its next major report in 2021 or 2022. It is completed by a synthesis report that integrates the working group contributions and any special reports produced in that assessment cycle.The IAC found that, "The IPCC assessment process has been successful overall". This change in emphasis appears to be the result of a summary process in which scientists work with policy makers on the document. Reports. The assessments build on previous reports, highlighting the latest knowledge. The panel, however, made seven formal recommendations for improving the IPCC's assessment process, including:There are several types of endorsement which documents receive:The IPCC First Assessment Report (FAR) was completed in 1990, and served as the basis of the UNFCCC.Authors for the IPCC reports are chosen from a list of researchers prepared by governments and participating organisations, and by the Working Group/Task Force Bureaux, as well as other experts known through their published work.

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