Gap Fill - Colonizing Space - Level 4

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   asteroids      civilization      collapse      factories      giant      multi      pristine      rates      resources      vacations   

Paragraph 2

Elon Musk agrees with Mr Bezos. He said: "We want to be a -planet species." He warned that: "Population due to low birth is a bigger risk to than global warming." Bezos said people would live in space stations, and would visit Earth for . He thinks Earth's environment will be again because of built in space. He said they could get from instead of from Earth.

Try the Colonizing Space - Level 5 gap fill.

Back to the a trillion humans lesson.

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