Charles David Keeling gets the US Weather Bureau to install equipment at the Mauna Loa Observatory to start direct, high-precision measurement of CO2 concentrations in the atmosphere.
Paul Crutzen warns that human actions may damage the ozone layer.
The National Academy of Sciences issues its first major report on Global Warming: "We may not be given a warning until the CO2 loading is such that an appreciable climate change is inevitable."
The golden toad becomes the first species declared extinct due to global warming.
The Montreal Protocol is implemented to phase of Chlorofluorocarbons use in order to reverse damage to the ozone layer. It is the most signed treaty in United Nations history. Ozone layer expected to reverse by 2050.
The Intergovernmental Panel on Climate Change (IPCC) is established by the World Meteorological Organization and the United Nations Environment Programme.
President George H. W. Bush signs the U. N. Framework Convention on Climate Change at the Earth Summit in Rio de Janeiro. The U.S. Senate approves the Framework Convention by unanimous consent.
The Intergovernmental Panel on Climate Change issues its Second Assessment Report: "The balance of evidence suggests a discernible influence on global climate."
The Kyoto Protocol sets binding obligations for controlling greenhouse gases in industrialized countries. Has not been ratified by the United States. Canada has withdrawn from the protocol.
The National Academy of Sciences of the eight major industrialized nations issue a joint statement: "The scientific understanding of climate change is now sufficiently clear to justify nations taking prompt action."
California unveils plans for reducing its greenhouse gas emissions to 1990 levels by 2020 and files lawsuits against six vehicle manufacturers for their contribution to global warming.
The Bulletin of the Atomic Scientists moves the hand of the Doomsday clock forward by two minutes, making it five minutes to midnight, citing global warming and nuclear proliferation.
Meetings are held at the UN in New York and among major emitters in Washington, ahead of talks in December on the issue of deepening cuts after 2012, when the first commitment period under the Kyoto Protocol expires.