If the Global Warming Science Is So Solid, Why Can't Anyone Agree on A Prediction?

Easy---because it's not solid:

Contrary to popular accounts, very few scientists in the world - possibly none - have a sufficiently thorough, "big picture" understanding of the climate system to be relied upon for a prediction of the magnitude of global warming. To the public, we all might seem like experts, but the vast majority of us work on only a small portion of the problem.

Here, for example, is an insight that even many climate scientists are unaware of: The one atmospheric process that has the greatest control on the Earth's climate is the one we understand the least - precipitation.

Over most of the planet, water is continuously evaporating, humidifying the air to form the Earth's dominant greenhouse gas: water vapor. Climate scientists will tell you that the extra CO2 we are putting in the atmosphere causes a "warming tendency" at the surface, which will evaporate even more water, which will amplify the warming. This positive water vapor feedback, so the theory goes, ends up turning the relative benign direct warming effect of CO2 - only 1 degree of warming late in this century - into a much more serious problem.

But surface evaporation is not what determines how much water vapor, on average, resides in the atmosphere - precipitation systems do. These not only control the water-vapor portion of the greenhouse effect, they directly or indirectly control most of the next most important greenhouse ingredient: clouds.

These systems continuously recycle the Earth's air, and so exert strong controls over the entire climate system. For instance, the rising air in precipitation systems is what causes the sinking, cloudless air over desert areas. Vast oceanic areas of stratus clouds form below a temperature inversion that is also caused by air being forced to sink by precipitation systems, usually thousands of miles away.

Wanna have some fun?

Bet your favorite greenie he can't predict the global mean temperature for 2017 within 1 degree.

If the science were so solid, this should be highly predictable, no?

Bet him $1,000 and see.

And get it in writing.

Greenies have been known to, er, rewrite history.