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The Great Smog of London, or Great Smog of 1952, was a severe air-pollution event that affected the British capital of London in early December 1952.
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The NEPA (National Environment Policy Act) was passed by the US Government in 1969, giving the environment the same status as economic priorities. Over the next two decennials, many other countries have also adopted the EIA as part of their Government.
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United Nations Environment Programme (UNEP) adopts the EIA.
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The World Bank begins to promote EIA in its policies.
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The Montreal Protocol on Substances that Deplete the Ozone Layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion.
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The 1999 Gothenburg Protocol to Abate Acidification, Eutrophication and Ground-level Ozone (known as the Multi-effect Protocol or the Gothenburg Protocol) is a multi-pollutant protocol designed to reduce acidification, eutrophication and ground-level ozone by setting emissions ceilings for sulphur dioxide, nitrogen .
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