Washington Post: When thinking about greenhouse gas emissions, there are a few obvious sources that come to mind, such as cars or coal-burning plants. But there are also some huge natural reservoirs of carbon on Earth, known as carbon sinks, which could pour huge amounts of carbon dioxide into the atmosphere if they were unleashed. The worlds forests are one major example. Trees store large amounts of carbon while theyre alive but when they die, they release all that carbon back into the atmosphere. So as...