Sucking carbon out of the air, and then using it to make net-zero fuels for shipping, is an appealing solution as the industry faces pressure to slash greenhouse gas emissions.

But despite the threat they represent to the climate, CO2 molecules make up a tiny percentage of the atmosphere, so to use direct air capture (DAC) technology to tease out carbon requires sifting a lot of air — and spending a lot of money.

Georgios Plevrakis, vice president of global sustainability at ABS, said a key problem facing the role of carbon capture in greening shipping’s fuel supply chain is figuring out how to make DAC and other technologies more efficient.