International train travel is at least 4.5 times more environmentally friendly than flying. So why is it still so complicated to book routes? And is new legislation from Brussels providing a long-awaited answer?

New software uses artificial intelligence to design more fuel-efficient aircraft. Will the technology sufficiently reduce aircraft emissions?

Heavy jet liners need vast amounts of fuel to take off and maintain flight, making them by far the least sustainable form of travel. A new Swedish startup believes that a future of completely electric flight could be on the horizon.