Travel can drive overtourism, contribute to climate change and support problematic political systems. Yet the industry also creates livelihoods and fosters exchange.

Sky News has spent time with a squad of enforcement officers tasked with tracking down fly-tippers. It's a game of cat and mouse as they walk the streets of Brent, London, looking for clues.

Italian clubs are on the brink of a historic Champions League embarrassment, with the prospect of none making the last 16.