A number of carriers have launched into a bet on certain alternative fuels without knowing if there is enough green energy once the ships hit the water. Others opt for liquefied natural gas (LNG). And others yet argue that there is a need to gain a more complete view of the market before making any annonucements. And for most can be said that they are in the process of investing in water bubbles that facilitate propulsion, digitization or better weather prognoses or something entirely different to bring down CO2 emissions.