Natural gas replacing diesel in the shipping industry

Speaking of fake environmentalists with a hidden agenda, Fortis ran a commercial recently about using natural gas to fuel ships instead of diesel. That would be a huge step forward for the environnement. If semi-trailers ran natural gas instead of diesel, CO2 emissions would be greatly reduced. The fake environmentalists don't support this because they are fake environmentalists. Reducing emissions and saving fuel costs. Now that's a win win. Saudi is doing it now too.