The shipping industry emits 10% of global transport emissions but its emerging cleantech (e.g. hydrogen, ammonia, batteries) is still 10-20 years from maturity and will be extremely expensive to scale to large ships that travel long distances. We are developing a turnkey carbon capture service for large ships that breaks down technical, operational, and commercial barriers to reducing their emissions in the near future. This will increase their competitiveness, enable charging a premium for green shipping, and save them from expensive penalties from upcoming emissions regulations.