The United Nations Global Conference on Climate Change: A Final Opportunity?

In December, nearly all the countries in the world gathered in Paris for the 21st Conference of the Parties (COP21) to forge a legally binding, global agreement to effectively confront climate change. What will be the measure of success and what are the consequences of failure? Christopher Field of Carnegie Institution's Global Ecology and Katharine Mach, Intergovernmental Panel on Climate Change, will present their first hand assessment after attending the Paris Conference.