Humanity has all its eggs in one basket. Since life first evolved on Earth great extinction events have caused the demise of the species. Scientific progress is leading slowly towards a time when the basics of interplanetary travel will be affordable and a realistic proposition, but humanity needs to unite in an effort to develop those key technologies that are required to start a self-sufficient population on Mars and further afield. Let us free humanity from dependence upon one planet, and let's do it soon!
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