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Based on current models, we predict: under [BAU] increase of global mean temperature during the [21st] century of about 0.3 °C per decade (with an uncertainty range of 0.2 to 0.5 °C per decade); this is greater than that seen over the past 10,000 years; under other ... scenarios which assume progressively increasing levels of controls, rates ...
The four SRES scenario families [8] [9] [10] of the Fourth Assessment Report vs. projected global average surface warming until 2100 AR4 (Summary; PDF) More economic focus: More environmental focus: Globalisation (homogeneous world) A1 rapid economic growth (groups: A1T; A1B; A1Fl) 1.4 − 6.4 °C: B1 global environmental sustainability 1.1 − ...
In the report, there are guidelines for both responses in the near term and in the long-term. According to the report, the main source of the increase in global warming is due to the increase in CO 2 emissions, stating that it is likely or very likely to exceed 1.5 °C under higher emission scenarios. [8]
The key conclusions of Working Group I [11] were: . An increasing body of observations gives a collective picture of a warming world and other changes in the climate system (The global average surface temperature has increased over the 20th century by about 0.6 °C; Temperatures have risen during the past four decades in the lowest 8 kilometres of the atmosphere; Snow cover and ice extent have ...
1 February: a study published in PLOS Climate projected a decline in global thermal refugia for coral reefs from 84% (2022) to 0.2% (at 1.5 °C of global warming), and 0% (at 2.0 °C of global warming), stating that management efforts on thermal refugia may only be effective in the short term. [137]
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 ...
For example, the IPCC Special Report on Global Warming of 1.5 °C was a "key scientific input" into the 2018 United Nations Climate Change Conference. [4] Various pathways are considered in the report, describing scenarios for mitigation of global warming.
The IPCC Special Report on Global Warming of 1.5 °C (2018) included detailed analysis of the probable differences in impact of "limiting global warming to 1.5 °C compared with 2 °C", warning that a 2 °C temperature increase would worsen impacts that include extreme weather, Arctic sea ice decline, rising sea levels, coral bleaching, and ...