According to the IPCC, each of the last three decades has been successively warmer than any other decade since 1850. It was calculated that, since the industrial revolution, land and ocean in average warmed +0.85°C.
The link between the current global warming and human emissions is scientifically certain: paleoclimatology, that is the study of Earth’s climate in the past, proved that there never was a similar rapid increase in carbon concentration in such a short time. CO2 atmospheric concentration in the last 10.000 years was comparatively stable, well under 300 ppm. Only in the last two centuries it began growing, with a steep increase after theSecond World War. In this moment, concentration levels are the highest in the last 800.000 years.
The IPCC has elaborated 4 “Representative Concentration Pathways” (RCP) that show to what point, with different emission levels and relative carbon concentration in the atmosphere, average temperatures are going to increase. In the business-as- usual scenario (RCP 8.5), we are going towards an average +3.7°C increase.
The warming is not uniform: temperatures have already gone up about twice their average in some areas and as much as four times in some Arctic regions. The impacts are enormous, and affect ecosystems at global level.