Fifteen years ago, China changed its policy so people could buy their own homes. Real-estate investments boomed, and new cities began popping up. The problem is: people don't live in what have become 'ghost cities.' Over two years ago, Arab Spring climaxed in the overthrow of President Mubarek in Egypt. But for many Egyptians, the situation has actually gotten worse.

The most popular sport in the West African country of Senegal isn't soccer--it's laamb, combining Greco-Roman wrestling moves with eclectic pre-fight rituals and dances. The global sea level rose by 22 cms in the past 100 years--and is expected to rise even faster in the years to come. The evidence can be seen in Venice, the Maldives, and beyond.