[SteamShovel]

but would only consider regulations to prevent contrails!!!

If they do this, they only prove they are exceptionally stupid, to modern society's detriment.

To ban contrails would not only eliminate aircraft because there is no way to prevent water vapor from airplane engines.....

.....But even if the water vapor was invisible (no contrail), there would still be water vapor.

This would also affect cooling towers, smokestack, and vehicles since there is a lot of water in the products of combustion (laying bare the notion that we are somehow using up water in the modern world).

In addition, water vapor is 100% uncontrollable. It forms and condenses constantly by the sun's action.

The amount that man adds is absolutely a TINY FRACTION of that which is made by nature.

[palmer]

The cirrus clouds and contrails cause some small amount of warming. Water vapor below 15 or 20k feet causes nothing compared to natural water vapor. So smokestacks etc are irrelevant. Of course plane contrails are mostly irrelevant too.