I was curious about this too, basically they're just filtering air as they go and counting it as negative emissions: https://www.altenergymag.com/story/2021/03

I was curious about this too, basically they're just filtering air as they go and counting it as negative emissions: https://www.altenergymag.com/story/2021/03/can-fuel-cell-technology-clean-the-air/34725/ https://www.altenergymag.com/story/2021/03/can-fuel-cell-tec...