How Paris Agreement's "ratchet mechanism" could limit warming below 2°C

According to analysis by Climate Interactive and MIT Sloan, the commitment to review national pledges every five years, starting in 2018, and willingness of nations to offer deeper, earlier emissions cuts at that time and continue progress, projected warming could be limited to 2°C.  Analysis is made with the C-ROADS (Climate Rapid Overview and Decision Support) computer simulation, which is calibrated to the Intergovernmental Panel on Climate Change’s (IPCC) Fifth Assessment Report results.