In SSP5, emissions rise too far and fall too slowly to meet the Paris targets without large amounts of negative emissions in the latter part of the century, to offset slower near-term emissions reductions. Three out of four SSP5 models were able to develop possible scenarios to achieve RCP2.6 targets of limiting warming below 2C, while only two out of four were able to find a way to reach RCP1.9 and limit warming to below 1.5C. Others, such as SSP1 and SSP4, have a much larger share of energy coming from renewable sources, with some electrification of current fossil fuel end-uses, such as transportation or heating, but driven by falling costs rather than climate concerns. SSP2 represents a “middle of the road” scenario historical patterns of development are continued throughout the 21st century. The world follows a path in which social, economic, and technological trends do not shift markedly from historical patterns. Development and income growth proceeds unevenly, with some countries making relatively good progress while others fall short of expectations. Global and national institutions work toward but make slow progress in achieving sustainable development goals. Environmental systems experience degradation, although there are some improvements and overall the intensity of resource and energy use declines. Global population growth is moderate and levels off in the second half of the century. Income inequality persists or improves only slowly and challenges to reducing vulnerability to societal and environmental changes remain. With the release of the SSPs, modellers have expanded the range of mitigation targets that they are considering. The IPCC fifth assessment report focused on RCP2.6, RCP4.5, RCP6.0 and a high-end no-mitigation RCP8.5 pathway. The SSPs have added RCP1.9, RCP3.4 and are planning to add RCP7.0.

One group of researchers then developed the “ Representative Concentration Pathways” (RCPs), describing different levels of greenhouse gases and other radiative forcings that might occur in the future. They developed four pathways, spanning a broad range of forcing in 2100 (2.6, 4.5, 6.0, and 8.5 watts per meter squared), but purposefully did not include any socioeconomic “narratives” to go alongside them. However, estimates outside of the United Nations have put forward alternative models based on additional downward pressure on fertility (such as successful implementation of education and family planning goals in the UN's Sustainable Development Goals) which could result in peak population during the 2060–2070 period rather than later. [3] [7] The Galaxy S21 series will not go gentle into the night. On the contrary, it will produce one last bang before the Galaxy S22 steals the spotlight. The last of the S21 series caters to the true fans of the brand and combines all Galaxy S21 essentials into one powerful no-nonsense smartphone. Yes, this is the Galaxy S21 FE 5G.

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They include: a world of sustainability-focused growth and equality (SSP1); a “middle of the road” world where trends broadly follow their historical patterns (SSP2); a fragmented world of “resurgent nationalism” (SSP3); a world of ever-increasing inequality (SSP4); and a world of rapid and unconstrained growth in economic output and energy use (SSP5).

While the rapid technological development in SSP4 makes it easier to attain more modest mitigation targets, the high inequality makes it more difficult to attain very strong emission reductions, particularly for land-use emissions in poorer countries. This means that, while all three SSP4 models can reach a RCP2.6 target, only one of three can reach of RCP1.9 and limit warming to below 1.5C.World Bank Migration and Remittances Factbook 2016" (PDF). World Bank Open Knowledge Archive. 2016. It is also possible that the world will follow more of a SSP1 or SSP4 pathway of rapid technological development and falling costs of things such as solar energy, battery storage, transmission technologies and other changes. These would reduce barriers to mitigation and result in more modest emissions and warming, even in the absence of climate policies.