The Global Carbon Project has just published the most comprehensive Global Hydrogen Budget to date.
H2, although not a GHG, has an indirect Global Warming Potential 37 times more potent than CO2.
Carbon Brief:
www.carbonbrief.org/hydrogen-emi...
Research paper:
www.nature.com/articles/s41...
The warming impact of hydrogen has been “overlooked” in projections of climate change, authors of the latest “global hydrogen budget” say.