New York Times: One of the most sobering realities of climate change is that even if all greenhouse gas emissions came to an abrupt halt tomorrow, climbing temperatures, rising seas and extreme weather would still be in the global forecast for perhaps hundreds of years because of the carbon dioxide already released into the atmosphere. To get some perspective, the story of the ozone hole over Antarctica illustrates how even a relatively small perturbation in the atmosphere can have wide-reaching and long-lasting...