Cleveland Clinic advertising supports our core mission and helps us improve our site as a resource for trusted health content. Learn how to advertise with Cleveland Clinic.| Cleveland Clinic
Today, over 4 billion people around the world – more than half the global population – live in cities. This trend is expected to continue. By 2050, with the urban population more than doubling its current size, nearly 7 of 10 people in the world will live in cities.| World Bank