The Intergovernmental Panel on Climate Change (IPCC) is an international body established by the World Meteorological Organization and the United Nations Environment Programme to provide authoritative assessments on climate change. The IPCC's Fourth Assessment Report, "Climate Change 2007," includes a Synthesis Report that integrates findings from three working groups, covering the physical science basis, impacts, adaptation, and vulnerability, and mitigation of climate change. The Synthesis Report confirms that climate change is occurring now, primarily due to human activities, and highlights the impacts of global warming on natural systems and human society. It also discusses adaptation and mitigation strategies, as well as the long-term perspective of climate change in the context of sustainable development. The report is based on the work of over 500 lead authors and 2000 expert reviewers, and was adopted at the IPCC's Twenty Seventh Session in Valencia, Spain. The Synthesis Report provides a summary of the key findings and uncertainties related to climate change, including observed changes in climate, causes of change, projected future climate change, and its impacts. It also addresses the need for policies and technologies to limit future climate changes. The report is a comprehensive summary of the IPCC's findings and is intended to assist governments and other decision-makers in formulating and implementing appropriate responses to the threat of human-induced climate change. The Synthesis Report is based on the assessments of the three working groups and provides a synthesis of the issues of concern to policymakers in the domain of climate change. It confirms that climate change is occurring now, mostly as a result of human activities, and illustrates the impacts of global warming already under way and to be expected in the future. The report also describes the potential for adaptation of society to reduce its vulnerability and presents an analysis of costs, policies, and technologies intended to limit the extent of future changes in the climate system. The Synthesis Report is a key document in the IPCC's efforts to provide authoritative information on climate change and to support decision-making on climate change.The Intergovernmental Panel on Climate Change (IPCC) is an international body established by the World Meteorological Organization and the United Nations Environment Programme to provide authoritative assessments on climate change. The IPCC's Fourth Assessment Report, "Climate Change 2007," includes a Synthesis Report that integrates findings from three working groups, covering the physical science basis, impacts, adaptation, and vulnerability, and mitigation of climate change. The Synthesis Report confirms that climate change is occurring now, primarily due to human activities, and highlights the impacts of global warming on natural systems and human society. It also discusses adaptation and mitigation strategies, as well as the long-term perspective of climate change in the context of sustainable development. The report is based on the work of over 500 lead authors and 2000 expert reviewers, and was adopted at the IPCC's Twenty Seventh Session in Valencia, Spain. The Synthesis Report provides a summary of the key findings and uncertainties related to climate change, including observed changes in climate, causes of change, projected future climate change, and its impacts. It also addresses the need for policies and technologies to limit future climate changes. The report is a comprehensive summary of the IPCC's findings and is intended to assist governments and other decision-makers in formulating and implementing appropriate responses to the threat of human-induced climate change. The Synthesis Report is based on the assessments of the three working groups and provides a synthesis of the issues of concern to policymakers in the domain of climate change. It confirms that climate change is occurring now, mostly as a result of human activities, and illustrates the impacts of global warming already under way and to be expected in the future. The report also describes the potential for adaptation of society to reduce its vulnerability and presents an analysis of costs, policies, and technologies intended to limit the extent of future changes in the climate system. The Synthesis Report is a key document in the IPCC's efforts to provide authoritative information on climate change and to support decision-making on climate change.