Charley, two questions:

1) I would assume all the arrows in the graphic above involve some kind of process that consumes energy. Will all of that energy be renewable, or will the process itself create even more carbon emissions than simply leaving the plastic in the ground?

2) Because all plastics are made from synthetic hydrocarbon chains, there is no process that can simply convert plastic to hydrogen - there will be carbon as a byproduct. And because there is no accounting for what will happen to that carbon, we can safely assume it will be emitted to the atmosphere, where it will quickly combine with oxygen to form CO2. Leaving me to wonder: is hydrogen-from-plastic anything more than a craven attempt to cash in on the "green" energy craze, or am I missing something?

Interesting development to watch--- the deluge of plastics in landfills, in oceans, and elsewhere is a crisis that too many are only giving lip service too. While finding sustainable and circular end of life for the needed plastic products is necessary, hopefully this also comes with a clear plan to minimize the amount of plastics created in the first place as well!