If we get to a point where we aren't emitting greenhouse gases in order to get hydrogen from water, that might help... for some niche applications, such as airlines. Logistics is still a problem as is volitility and the energy required to store it under explosive pressure so that it has a decent energy density. And that's only if we don't have better options for airplanes (or maybe cargo ships) by the time creating hydrogen isn't as much of a pollutant. And assuming battery technology doesn't improve.

Cool, cool. And how much waste does this produce? How much CO2?

Because getting hydrogen from water isn't really the problem. It's that it's wasteful and polluting to produce and transport and potentially dangerous to store.

I know it's at the behest of oil execs wanting to find something they can corner the market on (the production and supply side of it) to stay wealthy as the world tries to get out of their grips... but even so, why are we still wasting time on hydrogen fuel?

This happens because the warm and humid air holds more moisture than cold air. When the air touches the window, it cools down and the excess moisture collects on the glass, eventually enough collects to drip down.

I'm guessing you don't have some sort of AC/central air which would help reduce the air humidity.

Better insulated windows would help, but likely isn't an option.

So you'll want to try to dehumidify your warmer air. Most likely with a dehumidifier.