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Every increment of global warming will intensify multiple and concurrent hazards (high confidence). Deep, rapid, and sustained reductions in greenhouse gas emissions would lead to a discernible slowdown in global warming within around two decades, and also to discernible changes in atmospheric composition within a few years ( high confidence )."
The Global Carbon Project reports that carbon emissions in 2022 remain at record levels, with no sign of the decrease that is needed to limit global warming to 1.5 °C. At the current rate, the carbon that can still be emitted while still meeting the 1.5 °C global goal will likely (at a 50% chance) be emitted within only around nine years.
RCP 2.6 is a "very stringent" pathway. [6] According to the IPCC, RCP 2.6 requires that carbon dioxide (CO 2) emissions start declining by 2020 and go to zero by 2100.It also requires that methane emissions (CH 4) go to approximately half the CH 4 levels of 2020, and that sulphur dioxide (SO2) emissions decline to approximately 10% of those of 1980–1990.
The size of this warming is broadly consistent with predictions of climate models, but it is also of the same magnitude as natural climate variability. Thus the observed increase could be largely due to this natural variability; alternatively this variability and other human factors could have offset a still larger human-induced greenhouse warming.
The report's 200-plus authors looked at five warming scenarios and concluded that all will see the world exceed the 1.5-degree threshold set out by the 2015 Paris climate in the 2030s — sooner ...
The global average and combined land and ocean surface temperature show a warming of 1.09 °C (range: 0.95 to 1.20 °C) from 1850–1900 to 2011–2020, based on multiple independently produced datasets. [8]: 5 The trend is faster since the 1970s than in any other 50-year period over at least the last 2000 years.
Climate change mitigation scenarios are possible futures in which global warming is reduced by deliberate actions, such as a comprehensive switch to energy sources other than fossil fuels. These are actions that minimize emissions so atmospheric greenhouse gas concentrations are stabilized at levels that restrict the adverse consequences of ...
The goal was to create a global framework that will link scientific advances in these climate predictions and the needs of their users for decision-making to better cope with changing conditions. Key users of climate predictions include food producers, water managers, energy developers and managers, public health workers, national planners ...