National Geographic: This winter, the United Nations Climate Change Conference (COP21) in Paris will feature one of the largest gatherings of world leaders to ever address global warming. The stage is set for all United Nations member states to come together and create an international agreement on the climate with the goal of keeping global warming below 2°C. In anticipation of this opportunity, President Barack Obama announced an action plan to combat climate change in June. Also this summer, Pope Francis demonstrated...