Carnival is the target of environmentalists' ire for using high-sulphur fuel oil on its Arctic cruise schedule.

An online petition — sponsored by Transport & Environment, Stand.earth, Pacific Environment and Friends of the Earth — "call(s) on the cruise giant to stop using one of the world’s cheapest and dirtiest fossil fuels — heavy fuel oil — on ships traveling in fragile Arctic and sub-Arctic waters."

The petition calls for Carnival to switch to low-sulphur diesel and end the use and carriage of heavy fule oil for its Canada, Alaska and Arctic itineraries.