The Intergovernmental Panel on Climate Change (IPCC) is the main organization about the analysis of climate changes. This organization collects studies and processes all the information obtained with the aim of producing final reports, the last IPCC report is the "Fifth Assessment Report" (AR5) which was published in 2014. In the Fifth Assessment Report are also discussed some future climate projections, in which different rate of greenhouse gas emissions are expected, assembling different climate models. The projections are called Representative Concentration Pathways (RCPs) and in AR5 four of these are examined and they represent three different kind of scenarios with different rates of changing.