In 2100, the average temperature could be from 1.8 to 4°C higher than today. This is the conclusion of the climate models developed by the IPCC. These models are based on 4 pictures of the future for the 21st century (the SRES story lines: A1, A2, B1 and B2). This publication shows that these 4 pictures of the future are mainly worst-cases scenarios with limited representativeness. None of these scenarios takes into account any climate policy, the fossil shortage or a clean tech environment.