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Once the most prolific bird, the passenger pigeon becomes extinct
Conservation movement grows. Concern for tigers, rhinoceros, etc. -
Green Revolution - intensive technological agriculture
Resource use (especially fossil fuel use) and pollution increased. Human population rises sharply -
Leopold writes "A Sand County Almanac'
Concept of 'stewardship' is applied to nature -
Period: to
Convention on Long-Range Transboundary Air Pollution
The Convention on Long-Range Transboundary Air Pollution, often abbreviated as Air Pollution or CLRTAP, is intended to protect the human environment against air pollution and to gradually reduce and prevent air pollution, including long-range transboundary air pollution. -
Period: to
Montreal Protocol
is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. It was agreed on 26 August 1987, and entered into force on 26 August 1989 -
Period: to
Kyoto Protocol
is an international treaty which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhouse gas emissions, based on the premise that (a) global warming exists and (b) human-made CO2 emissions have caused it. It was adopted on 11 December 1997, and entered into force on 16 February 2005.
