Hydrogen is viewed as a promising alternative to fossil fuel, but the methods used to make it either generate too much carbon dioxide or are too expensive. Rice University researchers have found a way to harvest hydrogen from plastic waste using a low-emissions method that could more than pay for itself.
Doesn’t say, but if the electricity used is from renewables then it’s irrelevant, as it can potentially produce graphene at 5% of the current price
Found this re co2
https://phys.org/news/2023-02-joule-technique-efficiently-would-be-pollution.html
If they’re making graphene and hydrogen then there can’t be much left over can there?