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" ... Green hydrogen meets the low-carbon threshold, but it is produced using renewable resources. For example, electricity from solar power can be used to electrolyze water into its constituents, hydrogen and water. Renewable production of hydrogen is the idealized vision of the hydrogen economy, but there are some obstacles that have thus far kept this vision from being realized. ... "
" ... Hydrogen is made using electricity to electrolyze water, separating it into oxygen and hydrogen atoms. When burned it does not create greenhouse gases and can be converted into ammonia for easy shipping. ... "
" ... I would need to know some details they probably aren't willing to give up. For example, water itself can't be a fuel. It's a combustion product. The only way to turn it into a fuel is to add energy somewhere. I could boil the water and turn it into steam. I could electrolyze the water to make hydrogen. I could add something (like sodium metal) that would react with the water to produce hydrogen. But each of these steps involves energy addition into the system." ... "