"More than half of all industrial emissions of carbon dioxide since the dawn of the Industrial Revolution will have been released since 1988" - Dr. Peter C. Frumhoff, Director of science and policy at the Union of Concerned Scientists
Carbon dioxide concentrations are at a record high of 411 parts per million (ppm) (an increase of over 45% on pre-industrial levels). Concentrations are now at the highest levels in at least the last 3 million years (i.e. since before modern humans had even evolved on this planet)
To stabilise temperatures net-emissions need to reach zero! The longer we delay the harder it becomes. Unfortunately, because of years of delay and inaction we have reached a crisis where we will only to meet our targets if we to take urgent emergency action!