See firsthand why London's Thames Barrier is no longer enough to keep the city safe from rising tides. The system has worked for decades, but due to increased environmental challenges, its location on a flood plain and heavy urbanization, London must now explore both low-tech fixes and some of the most advanced engineering solutions in the world.

Miami is beloved for its beaches and waterfront homes and businesses. See how engineers and planners are trying to protect Miami from rising seas and ever-more-frequent and violent storm surges that could destroy the city's tourist and business economy.