“Is that true? Why isn’t anyone talking about this?”
“Because it takes more than 140 characters to explain.”

Obviously, the author misspelled “Because it’s utterly retarded and easily refuted” in that last speech bubble.

First, “warmer air holds more water than cold air.” That’s true, but both meaningless and counterproductive for the argument. The claim here is that “warmer air”, defined as air that is currently warmer than is was 100 years ago, holds more water. That would be meaningful if the difference in temperature were 10 or 20 degrees Celsius, not the 1degree they claim for global warming.

But more importantly, like all global warming nutcases, they forget the difference between atmospheric temperature and ground temperature. Anything that affects atmospheric temperature will have the opposite effect on ground temperature because the primary source of heat is sunlight, and anything that absorbs sunlight in the atmosphere will prevent it from reaching the ground. That’s why cloudy days are so much colder than cloudless days (temperature at cloud level is higher, but lower at ground level). That’s why winter exists (Earth’s tilt causes sunlight to travel through a larger amount of atmosphere, thus causing it to lose most of its energy by the time it reaches the ground).

Anything that increases the moisture in the air will actively cause a cooling on the ground below it because water is really fucking good at absorbing sunlight (again, see clouds), and more than capable of offsetting the hell out of any “greenhouse effect” you might want to invent. You just can’t have an increase in atmospheric moisture and an increase in ground temperature (aka, global warming). Reality doesn’t work that way.