![]() Pollution and wars can destroy them more easily. Also, some planets can have far more fragile ecosystems then Earth. In some cases, once terraformed, there are some maintenance works needed to keep the planet habitable. ![]() ![]() Sometimes, there might be something unexpected in the chemistry of the planet, sometimes it might be all about a human error, an ice age can be caused by a change in the orbit or the behavior of the parent star. There are many unknown processes that can occur on a planet. Terraforming is a highly complex process that involves many risks.
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