Quote:
Originally Posted by tshiggins
An entire ecosystem that can feed on human life, but which evolved in complete isolation from humanity, means human beings have no natural defenses against local life forms.
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Note that the reverse can also be true, leading to anything from an "Australian rabbit problem" to a gray-goo scenario where Earth-derived microbes out-compete the local ecosystem's defenses.
It might be interesting to have three different outcomes: one world (younger or less competitive than Earth) where invasive species are ruining the ecosystem, one (older or more competitive) where Earth species struggle to survive, and one where the contest is on more or less equal terms.