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Summary for Policymakers (PDF). Climate Change 2007: Impacts, Adaptation and Vulnerability. Working Group II Contribution to the Intergovernmental Panel on Climate Change Fourth Assessment Report. Intergovernmental Panel on Climate Change, 2007. április 13. [2007. április 21-i dátummal az eredetiből archiválva]. (Hozzáférés: 2007. április 28.)
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Hegerl, Gabriele C.; et al.: Understanding and Attributing Climate Change (PDF). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change pp. 690. Intergovernmental Panel on Climate Change, 2007. május 7. [2018. május 8-i dátummal az eredetiből archiválva]. (Hozzáférés: 2007. május 20.) „Recent estimates (Figure 9.9) indicate a relatively small combined effect of natural forcings on the global mean temperature evolution of the seconds half of the 20th century, with a small net cooling from the combined effects of solar and volcanic forcings”
Summary for Policymakers (PDF). Climate Change 2007: Impacts, Adaptation and Vulnerability. Working Group II Contribution to the Intergovernmental Panel on Climate Change Fourth Assessment Report. Intergovernmental Panel on Climate Change, 2007. április 13. [2007. április 21-i dátummal az eredetiből archiválva]. (Hozzáférés: 2007. április 28.)
