Cruising has been heavily criticised for its effect on the environment but French line Ponant is aiming for a more sustainable future with its plans for a 200-passenger ocean-going ship it claims will be emission-free when sailing, manoeuvring, in port or at anchor.
Using new technology including rigid sails, half the propulsion for the Swap2Zero project will come from the wind. This will be supported by 1,000 square metres of solar panels and a fuel cell powered by liquid hydrogen cooled to -250C.