| | | Aerosols are there, true, but their impact is not as significant and are short lived. You might say that aerosols have been increasing due to emerging markets burning more coal, but that's more than offset by the heating due to associated CO2 emissions. Volcanoes come and go, but their cooling effects are short lived and offset by again GHG emissions. We could always hope for a global thermo-nuclear war to provide some cooling. How 'bout get rid of the ULSD/ULSG regulations and clean air restrictions on NOx/SOx to help with the particulates (never mind acid rain, mercury and dead lakes).
With water vapor, it needs some motive force to evaporate it... That could be a hotter sun or increases in the atmosphere's greenhouse properties by you name it... CO2/CH4 and other greenhouse gases (coming from human activities). With water vapor there's a cooling effect due to precipitation and a heating effect due to the GHG properties of H2O.
Clouds both stop transmission of heat from the sun to lower atmosphere, but they also trap heat transmitted from the Earth (most of the science says their net effect is not significant).
I don't think there's much significance in any of the items you listed. Perhaps you can come back with a detailed analysis on the actual heating/cooling contributions of each. I've heard from you folk, that we're going into another Ice age thanks to reduced solar/sunspot activity, changes in the earth's orbit, cosmic ray activity, meteors, chicken blood, and so on so forth. |
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