>>13798509So the curves flatten when the oil, coal and gas end?
RCP 4.5
RCP 4.5 is described by the IPCC as an intermediate scenario.[10] Emissions in RCP 4.5 peak around 2040, then decline.[13] According to resource specialists IPCC emission scenarios are biased towards exaggerated availability of fossil fuels reserves; RCP 4.5 is the most probable baseline scenario (no climate policies) taking into account the exhaustible character of non-renewable fuels.[14][15][16]
According to the IPCC, RCP 4.5 requires that carbon dioxide (CO
2) emissions start declining by approximately 2045 to reach roughly half of the levels of 2050 by 2100. It also requires that methane emissions (CH
4) stop increasing by 2050 and decline somewhat to about 75% of the CH
4 levels of 2040, and that sulphur dioxide (SO2) emissions decline to approximately 20% of those of 1980–1990. Like all the other RCPs, RCP 4.5 requires negative CO
2 emissions (such as CO
2 absorption by trees). For RCP 4.5, those negative emissions would be 2 Gigatons of CO
2 per year (GtCO2/yr).[9] RCP 4.5 is more likely than not to result in global temperature rise between 2 degrees C, and 3 degrees C, by 2100 with a mean sea level rise 35% higher than that of RCP 2.6.[17] Many plant and animal species will be unable to adapt to the effects of RCP 4.5 and higher RCPs.[18]
