Ceres is the extreme example of the Grineer’s utilitarian ignorance of the natural landscape. Their expanding shipyard operations pollute and shroud the planet in smog and industrial waste as they manufacture machines of war. These foundries are scattered across the solar system, giving them near-limitless reach with their fleets.
Strict laws on organic engineering impose severe mental and physical health limitations on the Grineer labour force. Whatever standard human stock they were originally derived from has been lost. Compliant and high-performing variants are often technically augmented to extend their lifespan beyond the few decades they can normally expect in operation.