As urban areas across the U.S. expand, many cities are trying to reduce their environmental impact while promoting sustainability, and Newsweek has plotted the greenest of them on a map. The election ...

and in order – from the largest first – the 30 biggest cities in the US are New York, Los Angeles, Chicago, Houston, Phoenix, Philadelphia, San Antonio, San Diego, Dallas, San Jose ...

Modeling suggests that if dropped on America's largest cities, a new nuclear warhead would cause death and widespread ...