Ahhh sorry, I didn't see that the previous person mentioned hydrogen bombs themselves.

Bringing up hydrogen bombs when discussing hydrogen engines is pretty disingenuous and fear mongery. Hydrogen itself is very flammable and dangerous in it's own right but is very different and much less dangerous than a hydrogen bomb.

What point are you arguing? I asked about energy amounts and you bring up rare earth metals.

Yes. I agreed that finite resource materials are required.

I suppose what your definition of "green" is required. I'm thinking of carbon emissions resulting in climate change.

What does this even mean? Over how long? Building the structures? Running it continuously? How does that energy equate to the amount it puts out?

Yeah but we aren't gonna give up modern day life. Yes renewables take finite non renewable resources, but they result in much less damage than the melting of the planet through climate change.