Uncertainty in projecting probable greenhouse-effect heating arises from uncertainty about

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All of the choices are correct in contributing to uncertainty in projecting probable greenhouse-effect heating. While the effects of CO2 are the most well-known and studied, there are other gases such as methane and nitrous oxide that also contribute to the greenhouse effect. Additionally, cloud cover can either amplify or mitigate warming, depending on its altitude and thickness. Finally, the relationship between CO2 emissions and resultant atmospheric CO2 levels can be influenced by factors such as deforestation and ocean uptake. Taken together, these uncertainties make it difficult to predict exactly how much global temperatures will rise in the coming decades.

Uncertainty in Projecting Probable Greenhouse-Effect Heating Arises from Uncertainty About