The production of fur is associated with high environmental costs. Far from being natural, sustainable resources, fur production is an intensely polluting and energy-consumptive process.
Animal skin, once removed, will rot, unless it is treated with toxic chemicals. Even then, it must be kept cool and guarded against insects. It takes at least 4 times more energy to produce a real fur coat than to produce a synthetic fur coat, mostly due to animal feed and emissions of manure.
Environmentally harmful products including chromium and formaldehyde are used in the processing of real fur garments to keep them from rotting. Many fur farmers and processors have been fined for releasing toxic waste into the environment.