U.N. Urges ‘Green’ Planning for Burgeoning Cities

From Bondi Junction in Australia to Bindura in Zimbabwe, millions marked World Environment Day on Sunday by planting trees, picking up litter and staging rallies aimed at making cities cleaner and greener.

By 2030, more than 60 percent of the world’s population will live in cities, up from almost half now and just a third in 1950, U.N. Secretary-General Kofi Annan said. The growth poses huge problems, ranging from clean water supplies to trash collection.