What’s the cons of excessive water vapour release?

Question

If Hydrogen electricity came into action, a clean and viable source which was zero-emissions and recycled what would be the cons of so much water vapour being given off?

Daniel.

Answer 1

Water vapour becomes clouds and rains back down, clearing it from the air faster than any other gas. It's also not a toxic gas, giving it no obvious cons.

Answer 2

Water vapor is the most powerful greenhouse gas on the planet when it is weighted by volume!  If you think CO2 is causing global warming, just wait until you see what happens when water vapor is released as exhaust.  If you would like a real world example, look at western US cities such as Las Vegas or Phoenix.  They used to have a typical desert climate, hot with low humidity.  Now with the abundance of pools and the wastefulness of waterfalls, etc in Vegas, it is still just as hot, but with moderate humidity, therefore the heat index is increased, so not only do humans (and other animals) feel hotter, but it will lead to increased energy usage due to A/C!  And so the vicious cycle would continue, pick your poison.  In my opinion, anything that releases water vapor is about the worst solution possible.

Answer 3

humidity, increased rainfall, floooding it may also help global warming because it can trap a lot of heat.

Answer 4

Hydrocarbon engines already release water vapour so it won't be much worse than it is now (and it's not like water vapour is causing us any problems).

BTW: We won't be getting hydrogen electricity, we'll be using nuclear electricity and might end up with hydrogen fuelled cars (we're still not sure what will replace oil for transportation, right now that part isn't solved).