Seoul’s eco-initiatives are some of the world’s top examples of progressive urban development, including a project that turned a busy commuter highway into an inner-city oasis.

Seoul’s rapid development has also brought on massive environmental problems, forcing the Korean government to decree that all new growth must be green. We take a look at Seoul’s many eco-initiatives that have made it one of the world’s best examples of progressive urban development, including a project that turned a busy, air-polluted commuter highway into an inner-city oasis.