Underground Farming in a London Bomb Shelter

There's a farm one hundred feet below London's streets. In an old World War II bomb shelter, innovators Steve Dring and Richard Ballard are growing salad greens with reclaimed water and lights powered by wind turbines. Finding ways to grow more food using less space will be key to feeding Earth’s growing population.

Click to read more about the farm under London.

By 2050 we'll need to feed two billion more people. Click here for a special eight-month series exploring how we can do that—without overwhelming the planet. 

Onward is a project to explore the world and share its untold stories. Click here to hit the road with National Geographic multimedia journalists Spencer Millsap and Dan Stone. Or tweet them at @spono and @danenroute to join the conversation.