Greenhouse
From Starport: Galactic Empires
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Greenhouse
Greenhouse worlds have sharply negative population growth. They produce primarily anaerobes and metal ore, with some medicine, oil, and uranium. The Ion Tower will completely hide all traces of your biodome and defenses from players with Neutrino scanners. The Ion Tower does not hide the tonnage of aliens or artifacts. Greenhouse worlds have a fairly slow rate of pollution.

