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I think you misunderstand the cited article on water vapor. The water cycle is self regulating, unlike other green house gases. >> "However, water vapor does

I think you misunderstand the cited article on water vapor. The water cycle is self regulating, unlike other green house gases. >> "However, water vapor does not control the Earth’s temperature, but is instead controlled by the temperature. This is because the temperature of the surrounding atmosphere limits the maximum amount of water vapor the atmosphere can contain." The other non condensing gases, largely from man made sources, contribute to global warming and elevate the amount of water that can be vaporized per unit volume of air. Cutting down on emissions by replacing oil based vehicles with electric/hydrogen fuel cell powered vehicles absolutely helps the environment. Cutting emission sources makes job of scrubbing the atmosphere of the green houses gases already present more achievable.

Accujack 7y ago
Okay, exhaust water from engines does not add greenhouse gases to the atmosphere in significant quantity to increase the rate of climate change - that happens naturally according to the temperature of the atmosphere. Not sure what I was thinking exactly when I wrote that. However, there are other reasons not to use hydrogen powered IC engines instead of electric engines, like the efficiency of electric motors vs. IC engines, the need to transport hydrogen fuel in greater volume than gasoline for the same range and power, potential issues with corrosion due to immediate condensation, safety issues in cold climates with exhaust immediately freezing on road surfaces, and others. If someone had a way to create liquid hydrogen with little energy, store it safely in a vehicle, and have an engine able to use it, that might change the game. Gaseous hydrogen, not so much. Hydrogen fuel from seawater is a neat idea compared to gasoline, but the chances of wide deployment of hydrogen fuels being a significant contribution to saving ourselves from climate change are minimal, in my opinion.

Accujack 7y ago

Okay, exhaust water from engines does not add greenhouse gases to the atmosphere in significant quantity to increase the rate of climate change - that happens naturally according to the temperature of the atmosphere. Not sure what I was thinking exactly when I wrote that. However, there are other reasons not to use hydrogen powered IC engines instead of electric engines, like the efficiency of electric motors vs. IC engines, the need to transport hydrogen fuel in greater volume than gasoline for the same range and power, potential issues with corrosion due to immediate condensation, safety issues in cold climates with exhaust immediately freezing on road surfaces, and others. If someone had a way to create liquid hydrogen with little energy, store it safely in a vehicle, and have an engine able to use it, that might change the game. Gaseous hydrogen, not so much. Hydrogen fuel from seawater is a neat idea compared to gasoline, but the chances of wide deployment of hydrogen fuels being a significant contribution to saving ourselves from climate change are minimal, in my opinion.