Abstract: |
It is a matter of discussion the magnitude of impacts caused by incremental thresholds of global temperature over the most important socio-economic and natural sectors. The focus is on the 2 °C and 1 °C thresholds. Based on a set of linear emission trajectories of CO2, a simple fuzzy model which estimates CO2 emissions for 2100, starting from the emissions projected for 2030 is shown. An additional fuzzy variable, the year for which the net carbon emissions begin to decrease, is also calculated. For the estimates of future global mean temperature increments, the simple climate model MAGICCv5.3, with moderate climate sensitivity, was used. The uncertainties of values of future emissions are easily included by a convenient selection of fuzzy sets in the input and output variables of the model. The results show that, in order to reach the 2 °C threshold, it will be necessary to require negative net emissions for years as close to 2030 as 2060´s and, even more, for the case of 1 °C. Indeed, 1 °C is, by now, far of the actual mitigation capabilities of the world. This information must be useful for the decision makers. The model developed can be extended for other values of global temperature increments. |