Position Statement. “Decades of scientific research have shown
that climate can change from both natural and anthropogenic
causes. The Geological Society of America (GSA) concurs with
assessments by the National Academies of Science (2005), the
National Research Council (2006), and the Intergovernmental
Panel on Climate Change (IPCC, 2007) that global climate has
warmed and that human activities (mainly greenhouse‐gas
emissions) account for most of the warming since the middle
1900s.” (read more…) The Geological Society of America is the
largest association of geoscientists in the world, comprising
22,000 members in 97 countries. Geoscientists have studied
climate longer than any other group of scientists. We study
climate of the past, present and future, the causes of climate
change, and the impacts on both the human and natural worlds. We
are in agreement that the Earth’s climate has warmed in the 20th
century, that human emission of greenhouse gases is the major
cause, and that a future of continued warmin