People should leave the earth

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Traveling to the mars is not a dream anymore. People now should consider about living on the mars. Stephan Hawkins warns that the humans should leave the earth within 100 years. The humans are at a risk of extinct due to the overpopulation, diseases, climate change. 

According to Mr. Hawking, this is the last generation of humankind. People should leave the earth if they want to survive.

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