The choice of climate-neutral cruises is growing for passengers Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice Havila Voyages has unveiled the date for its industry-first cruise powered by biogas and battery power. The Norway-focused cruise line revealed plans for the