Earth

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*Waiting to get the next spaceship*
Okay,i am barelly kidding..but to know witch places will be the worst,just watch for the most heavily populated by square km...
Quote from
www.citymayors.com (note for moderators : this quote is not available from the main website,got it from the google cache )
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Some 640 million people live
in the world’s 300 largest citiesTwo of the world’s cities,Seoul and Sao Paulo, have offiicial populations of more than ten million people. But probably there are two or three more cities that can claim to have reached the 10 million mark in 2003. Bombay, Jakarta and Karachi, all had populations well in excess of nine million at the end of the 20th century.
With a population of more than 10.2 million, Seoul, the capital of South Korea, is the world’s largest city in terms of population. Sao Paulo (Brazil), the world’s second-largest city, has a population of just over ten million. Three other cities, Bombay (India), Jakarta (Indonesia) and Karachi (Pakistan), have grown to more than nine million people.
Moscow, the Russian capital, is, according to City Mayors, the largest European city. London is in second place. In The Americas, Sao Paulo and Mexico City are ranked above New York City and Bogota (Colombia). Cairo (Egypt), with a population of 6.8 million, is Africa’s largest city.
Almost 100 Chinese cities each house more than one million people. Other countries with a significant number of ‘Millionenstädte’ include India (18 ), Indonesia (16), Japan (12), the US (9), Brazil (13) and Russia (12).
Some 36 European cities have populations of more than one million people. Most are the countries’ capital cities such as Moscow (8.3 million), London (7.1 million), Berlin (3.4 million) and Paris (2.2 million).
In The Americas, 45 cities can claim Millionenstadt status. Here, the top ranking cities are Sao Paulo (10 million), Mexico City (8.2 million), New York City (8.0 million), Bogota (6.4 million), Lima (5.7 million), Rio de Janeiro (5.6 million), Santiago di Chile (4.8 million) and Los Angeles (3.7 million). Toronto is Canada's largest city with a population of 2.5 million.
More than half of Asia’s ‘Millionenstädte’ are in China. Out of 194 Asian cities with populations of more than one million, some 98 are on the Chinese mainland and on Taiwan. Asia’s ten largest cities are Seoul (10.2 million), Bombay (9.9 million), Jakarta (9.4 million), Karachi (9.3 million), Shanghai (8.2 million), Tokyo (8.1 million), Bangkok (7.5 million), Beijing (7.4 million), Delhi (7.2 million) and Hong Kong (6.8 million).
Africa has 19 cities with more than one million people in each. Cairo, the Egyptian capital, is, with 6.8 million inhabitants by far the largest. African cities with more than two million residents include Alexandria (Egypt) Kinshasa (Congo), Addis Ababa (Ethiopia), Casablanca (Morocco) and Giza (Egypt). (Please note, some of the population figures for African cities are more than 15 years old. For example, the population figure for Kinshasa does not take into account the fall of the Mobutu regime and the subsequent civil upheaval in the Democratic Republic of the Congo, formerly Zaire.)