Claim: Worst-case global heating scenarios may need to be revised upwards in light of a better understanding of the role of clouds, scientists have said.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: For these reasons the role of tropospheric clouds in regulating weather and climate remains a leading source of uncertainty in global warming projections.

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Passage: Results from the CERES and other NASA missions, such as the Earth Radiation Budget Experiment (ERBE), could lead to a better understanding of the role of clouds and the energy cycle in global climate change.

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Passage: With this information, scientists can produce scenarios of how greenhouse gas emissions may vary in the future.

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Passage: Climate change is more accurate scientifically to describe the various effects of greenhouse gases on the world because it includes extreme weather, storms and changes in rainfall patterns, ocean acidification and sea level.".

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Passage: Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to 1.7 °C (0.5 to 3.1 °F) in a moderate scenario, or as much as 2.6 to 4.8 °C (4.7 to 8.6 °F) in an extreme scenario, depending on the rate of future greenhouse gas emissions and on climate feedback effects.

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Passage: This article is about climate change scenarios.

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Passage: Cloud cover may change in the future.

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Passage: The climatology hypothesis is that if each city firestorms, a great deal of soot could be thrown up into the atmosphere which could blanket the earth, cutting out sunlight for years on end, causing the disruption of food chains, in what is termed a Nuclear Winter scenario.

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Passage: If there are little clouds in a particular year, there is an energy imbalance and extra heat can be absorbed by the oceans.

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Passage: The Intergovernmental Panel on Climate Change, Third Assessment Report, says: "While the radiative forcing due to greenhouse gases may be determined to a reasonably high degree of accuracy... the uncertainties relating to aerosol radiative forcings remain large, and rely to a large extent on the estimates from global modelling studies that are difficult to verify at the present time".

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Passage: In preparation for the 2021 6th IPCC report, a new generation of climate models are being developed: some show climate sensitivity around , meaning temperature can rise by 6.5 - 7 degree by 2100 in the worst socio-economic scenario ("SSP5 8.5 – rapid economic growth driven by fossil fuels without mitigation").

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Passage: According to the , “the presence of black carbon over highly reflective surfaces, such as snow and ice, or clouds, may cause a significant positive radiative forcing.” The IPCC also notes that emissions from biomass burning, which usually have a negative forcing, have a positive forcing over snow fields in areas such as the Himalayas.

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Passage: There is a degree of scientific uncertainty about the contribution of contrail and cirrus cloud formation to global warming and attempts to estimate aviation's overall climate change contribution do not tend to include its effects on cirrus cloud enhancement.