CleanTechnica: The world reached a grim milestone recently, with atmospheric concentrations at the historic Mauna Loa observatory hitting the 400 parts per million mark due to ever increasing global carbon emissions. While this event rightly got the media coverage it deserved, rarely do we stop to appreciate the incredible job land and ocean sinks have played in ensuring this figure isnt significantly higher. Using data for all sources and sinks of human carbon emissions over the last 262 years this post highlights...