Half of the world’s population lives in cities, and that proportion is expected to increase to 70% by 2050. With their large populations, lack of green spaces that can cool a warming environment, and aging infrastructure that is vulnerable to floods and other extreme weather, many of the world’s cities are unprepared for climate change. Half of the world’s population lives in cities, and that proportion is expected to increase to 70% by 2050. With their large populations, lack of green spaces that can cool a warming environment, and aging infrastructure that is vulnerable to floods and other extreme weather, many of the world’s cities are unprepared for climate change. Environment Phys.org – latest science and technology news stories