This extra heat can raise temperatures in cities by about one to three degrees Celsius compared to rural areas.

VOA: special.2010.03.02

Their study considers painting sixty-three percent of rooftops white in one hundred large cities in warm areas around the world.

VOA: special.2009.06.19

In all three of America's biggest cities, murder rates have fallen to their lowest levels since the 1960s.

VOA: special.2009.01.12

The study examined employment records for eight cities in Minnesota for a three-year period through two thousand six.

VOA: special.2009.05.27