Global warming is more of a problem than most people may think. Every year, scientists measure the carbon dioxide levels at The Mauna Loa Observatory in Hawaii. Mana Loa is one of the few locations that scientists can take accurate measurements because it's one of the only areas that humans haven't polluted. In March 1958, about 50 years ago, the carbon dioxide levels were at 315 parts per million, as opposed to today where the carbon dioxide levels are at an all time high of 400 parts per million. Although CO2 levels are expected to increase during the spring and winter, at this current rate, in 2037, global warming will ruin the atmosphere. The damage humans have caused is irreversible and difficult to repair. 

 http://www.weforum.org/issues/climate-change-and-green-growth