The only reason anyone even believes it's possible to colonize space is because cognitive and perceptual biases cause us to assume that the human organism is separate from its ecosystem. It is not. The biosphere is one inseparably unified happening of which humans are part.
We developed these biases of perception out of evolutionary necessity; our recently-evolved prefrontal cortices gave us unprecedented capacity for abstract thought, but it couldn't help us advance our survival unless we thought of ourselves as separate from sabre-toothed cats etc
But really the biosphere isn't made up of separate "things" any more than a tornado or hurricane is. An organism is just a process, a happening, that is in nonstop interplay with the rest of the ecosystem on every level due to its need to eat, breathe, drink etc.
We're interconnected with this planet in so very, very many ways, many of which we probably don't even know about since we've never actually tried to live independently from it. Brief visits to space have been nothing more than glorified scuba excursions fully dependent on Earth.
But because we're conditioned to think in terms of a separation that doesn't actually exist in real life, we think we're these separate things that could just ship off into the stars. Really it's like thinking you can snip a swirling eddy out of the river it appears in.
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