Quote Originally Posted by Carrabow
We have solar and geothermal (convert this to steam and run it to a turbine) technology and in certain regions we can make lots of hydrogen. I guess we just have to put our hearts as a society into it.
Quote Originally Posted by Carrabow
Hydroelectric harnessing wind and waves There are lots of renewable sources, it will just take an initial investment.
Absolutely, I agree.

I believe though that we will find a better way through harnessing biomass from algae or some other process. That would be better because we need less steps of transformation and incur less loss and cost. Also biomass can replace oil as a raw material for the chemical industry.

If I am wrong it can be done as you mentioned. But as hydrogen is not as easily stored and used I guess we may use produced H2 in the Sabatier process or some similar process to procude methane (and water) which can be easier handled and better used as a fuel.

Sabatier reaction CO2 + 4H2 → CH4 + 2H2O