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I have a prediction, but it will take a long, long time to play out.
What is the exhaust from a hydrogen engine? It's water vapor. After hydrogen is the fuel of choice and in mass use, the amount of water vapor will increase, and thus cloud cover will increase. There will be increased rain and flooding and.....
What is the main greenhouse gas? It's water vapor. In fact, water vapor is 95% of the greenhouse gas in the atmosphere.
This, too, will come under fire as something man is doing that is going to ruin the planet. Whatever comes next will be they thing that will ruin the planet.
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