Earth
From Marspedia
Earth is the third planet from the Sun orbiting at a distance of approximately 149 million km. Earth, the third planet from the Sun (after Mercury and Venus), is the home planet of mankind and the most beautiful of all.
[edit] Physical
It has a natural magnetic field (which Mars has not) that protects from solar wind.
[edit] Sociological
The population on Earth is around 6000000000 persons, increasing exponentially.
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