The Science of Global Climate Change

The Intergovernmental Panel on Climate Change (IPCC) is an international scientific body established in 1988 by the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP) to “assesses the scientific, technical and socio-economic information relevant for the understanding of the risk of human-induced climate change.”

In 2007, the IPCC published Climate Change 2007: Synthesis Report, the culmination of six years of work by 450+ lead authors, 800+ contributing authors, 2500+ scientific expert reviewers from 130 countries.  In the Report, the IPCC concluded that “Warming of the climate system is unequivocal,” and that “Most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic [human-caused] GHG [greenhouse gas] concentration” (emphasis in original).  This position has been independently corroborated by other scientific bodies such as the National Aeronautics and Space Administration (NASA) and the National Oceanic and Atmospheric Administration (NOAA).

Their findings have also been accepted by the US Conference of Catholic Bishops, who in their 2001 document Global Climate Change: A Plea for Dialogue, Prudence, and the Common Good stated:
“[W]e accept the consensus findings of so many scientists and the conclusions of the Intergovernmental Panel on Climate Change (IPCC) as a basis for continued research and prudent action.”

The National Academies of Science: “The National Academies, which includes the National Academy of Sciences, National Academy of Engineering, Institute of Medicine, and the National Research Council, provide a unique public service by working outside the framework of government to ensure independent advice on matters of science, technology, and medicine. They enlist committees of the nation’s top scientists, engineers, and other experts, all of whom volunteer their time to study specific concerns.”  Their climate change website offers a variety of resources about climate change and impacts.

Michael MacCracken of the Climate Institute at the National Catholic Rural Life Conference in Washington DC, February 2005.   A summary of the key points are here. Download the PDF