It is point number 24 on the Notice of Race which all skippers have to respect . It stipulates that teams "must comply with various environmental standards, such as the obligation for boats to be delivered back from the finish under sail."
The teams have no qualms and fully endorse this new ruling, "It's a no-brainer," assures Anne-Claire Le Berre (Upwind by MerConcept, Ocean Fifty). "We're all trying to reduce our impact as much as possible, to decarbonize our activity, so for us it's normal. If there are no major issues on the boat that can't be repaired, I don't see any other solution other than to sail the boat back!"