Folks, NONE of it is due to "anthropogenic" causes. The earth is a HUGE heat sink, and the little bit of heat energy released by human activity, or any amount of heat captured by "excessive" carbon dioxide, shrinks to insignificance compared to the heat-retention power of a very common substance, water vapor. Water vapor, as clouds, REFLECTS away more solar heat than all the human sources of heat that can be generated on the entire planet, and it is done with absolutely no degree of control by any human agency.
Raising the water temperature even a fraction of a degree, involves the absorption of a VAST number of kilocalories of heat energy, and almost all of it is dissipated immediately by the conversion of water to water vapor, which rises to extreme heights in the atmosphere, and radiates off all its latent heat to become an ice crystal. These ice crystals float in the upper atmosphere, forming the very high cirrus clouds. Descending from these heights, the ice takes up more heat from the surrounding atmosphere, as it melts and becomes rain droplets.
Water vapor is from some twenty to over 100 times as potent a "greenhouse gas" as carbon dioxide could ever be. And it would be totally pointless to regulate water vapor.
Air Composition
The sea-level composition of air (in percent by volume at the temperature of 15̊C and the pressure of 101325 Pa) is given below.
Name-Symbol-Percent by Volume
Nitrogen-N2-78.084 %
Oxygen-O2-20.9476 %
Argon-Ar-0.934 %
Carbon
Dioxide-CO2-0.0384 %
Neon-Ne-0.001818 %
Methane-CH4-0.0002 %
Helium-He-0.000524 %
Krypton-Kr-0.000114 %
Hydrogen-H2-0.00005 %
Xenon-Xe-0.0000087 %
Water vapor is a highly variable component of the atmosphere, ranging from less than 1% to more than 4% of the volume of a given amount of air, and is expressed as "relative humidity".
Source:
CRC Handbook of Chemistry and Physics
by David R. Lide, Editor-in-Chief
1997 Edition
And it would be totally pointless to regulate water vapor.
If they can figure a way to tax it, they would try.