In 1990 UN climate experts reported that heat-trapping greenhouse gases generated by human activity are on the rise, and could intensify planetary warming.
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A general overview of the New York Action 2015 global mobilization event on September 24, 2015, in New York City. (B. BARKET/GETTY IMAGES FOR ACTION/2015/AFP)
The United Nations has been holding global climate summits, or COPs (Conference of the Parties), since 1995 as it tries to stabilise greenhouse gas emissions and prevent climate
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