13 ’Cool’ Photos Where the World Is Actually Crying for Help, and It’s Heartbreaking

Mexico City is almost there in the top 10 most overpopulated cities in the world. The number of its residents exceeds 20 million people and the density of the population is very high. However, some environmentalists don’t share the general pessimism over overpopulation and this photo shows the reality of having to live so close together from a unique vantage point.