This is myopic. 100,000 years ago, humans didn't understand the basic rules of how things worked. They would have no idea if and when the next ice age would happen. We've learned a lot as a species and as such, our biological need to reproduce is balanced by the logical realization of the impact we have on the planet and the impact the planet can have on us. We have higher-level thinking and more information to leverage second-order thinking. So no, that's not a joke.