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Online dating scams may have hit more than 200,000 people in the United Kingdom and go largely unreported, according to a study released on Wednesday.

Chinese skylines are defined by construction cranes and the din of jackhammers. China produces 50 percent of the world's cement [ pdf ]--the next largest producer, India is responsible for just 6 percent--to build seemingly endless tracts of high rises, railroads, parking lots, highways, airports and shopping malls.

Rapid urban growth and climate change will leave more than 1 billion urban dwellers with a water shortage by 2050, according to a study released last week.