(ecology, of fauna, or flora) that have populations transported as aliens to geographical areas by the direct or indirect, typically inadvertent, action of humans.
(Of a landscape, ecosystem, etc.) having been altered from its natural state by human activity to the point where the natural element is not as prominent as the human alterations.
The hypothetical process of deliberately modifying the atmosphere, temperature, surface topography or ecology of a planet, moon, etc. to make it similar to those of Earth and thus suitable for human life.
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