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cleanest countries in the world
countries co2 emissions
worst greenhouse countries
cleanest cities
most expensive cities
cities with the worst standard of living
best cities for quality of life
best cities in the world for art
most polite cities in the world
first cities to open subway
least healthy cities
most dangerous cities in the world
highest paying jobs
highest valued currency
city with the highest murder rate
most polluted place in the world
most depressing job
cheapest car
most common crimes
countries with the most prisoners
most prolific serial killer
highest murder rate
most powerful people
most wanted fugitives
richest people
most searched people
highest grossing movies of 2009
best-selling game
most popular blog
highest paid actors
fastest hundred meter runners
most world cup goals
most basketball assists
fastest tennis serve
