I'd agree, the concept of cracking hydrocarbons and then capturing the GHG byproduct effectively is just fantasy. At best a blue hydrogen fuel cell would be on

I'd agree, the concept of cracking hydrocarbons and then capturing the GHG byproduct effectively is just fantasy. At best a blue hydrogen fuel cell would be on par with a super clean natural gas combustion engine. You'd get CO~2~, water vapor, and electricity. Better than rolling coal but not better than "green" hydrogen or just a chemical battery. The math for blue hydrogen might work out in commercial and residential installations in regions with existing natural gas and siting that makes solar impractical. A fuel cell with a catalytic cracker could feed a building with hot water and electricity vs a combusting water heater that only provided hot water. For similar GHG output it might be an efficiency win. But I see that as a weak maybe all things considered.