Estimations of future global warming 6.0 A2 The scientists warned,the A1B 5.0 B1 temperature on Earth could Baseline year 2000 CO2 concentrations not be more than two 4.0 20th century Threshold degrees Celsius higher than 3.0 it was before the beginning 2.0 of industrialization (1850) 1.0 0.0 -1.0 1900 2000 212065 German Chancellor Angela Merkel vear A1FI Low P Hans Schellnhuber A2 High A1B Low p B2 Mode echnical chand A1T Low p e,renewable e B1 Low p ergy efficien Source:Clim Policymakers IntergovernnEstimations of future global warming Shanghai Jiao Tong University 2065 The scientists warned, the temperature on Earth could not be more than two degrees Celsius higher than it was before the beginning of industrialization (1850) Hans Schellnhuber German Chancellor Angela Merkel 2°C Threshold