The reason why fur, ivory, and whales have become obsolete in the Civ IV sense of the term is not political correctness, but rather is that modern technology provides alternatives that can serve the same purpose at a lower cost. Those alternatives make access to fur, ivory, and whales essentially irrelevant to most people's happiness for reasons completely independent of whether or not people accept the ideas of animal rights activists. The main impact of animal rights activists is on wealthy people who might otherwise buy things like fur coats or ivory chess sets mostly for the snob value of being able to afford them.
From a gameplay perspective, the main problem I see with resources becoming obsolete is that it can have a vastly greater impact on some civs than on others. A civ that's been relying on fur or ivory as a major trade good can have several trade deals collapse at once when the resource becomes obsolete. So instead of just losing access to one resource, the civ might lose access to several resources.
From a gameplay perspective, the main problem I see with resources becoming obsolete is that it can have a vastly greater impact on some civs than on others. A civ that's been relying on fur or ivory as a major trade good can have several trade deals collapse at once when the resource becomes obsolete. So instead of just losing access to one resource, the civ might lose access to several resources.
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