Vogue: Every year, the United Nations holds a summit on climate change, where it works to persuade countries large and small to give up fossil fuels. This annual gathering, now in its 21st year, is called the Conference of the Parties, and it begins today in Paris. Past negotiations have produced important treaties, such as the Kyoto Protocol and the Copenhagen Accord, but this years meeting, the COP21, is likely to yield the worlds first binding, universal agreement to cut carbon emissions and begin...