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Once the most prolific bird, the passenger pigeon goes extinct. This leads to a movement that focuses on keeping other endangered animals from going extinct.
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The Montreal Protocol on Substances That Deplete the Ozone Layer is a landmark international agreement designed to protect the stratospheric ozone layer. The treaty was originally signed in 1987 and substantially amended in 1990 and 1992.
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Kyoto Protocol - Toward Climate Stability. The Kyoto Protocol treaty was negotiated in December 1997 at the city of Kyoto, Japan and came into force February 16th, 2005.
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