1. Target Atmospheric CO 2 : Where Should Humanity Aim? Hansen et al (2008) Presented by: Xin He Anastasios Tsiolakidis

5. Slow and Fast Feedbacks Ice sheet disintegration, vegetation migration, and GHG release from soils, tundra or ocean sediments changes of water vapor, clouds and sea ice aerosols including dust Slow Fast

8. Fast-feedback climate sensitivity 3/4°C per W/m 2 (3°C for doubled CO 2 ) is a good approximation for the entire period

10. Global climate sensitivity including the slow feedback is 1.5°C per W/m 2 or 6°C for doubled CO 2

16. The proxy data indicate CO 2 was of the order of 1000 ppm in the early Cenozoic but <500 ppm in the last 20 My

21. Anthropecene 1) tipping level, the global climate forcing that gives rise to a specific consequence, (2) the point of no return, a climate state beyond which the consequence is inevitable