Given the challenges facing Earth (climate change, pollution, overpopulation etc) should we avoid having children?
i don't have children because i didn't want to have children. if i'd wanted them, i would not have let the earth's challenges stop me. we've always had challenges. our species reproduces and survives because that's what a species wants to do. challenges may change the way it reproduces and survives but the very essense of evolution is reproducing (not necessarily every individual) and surviving (definitely not ANY individual).
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I personally don't see the need to bring children into the world when our very existence is still in question. However, there are thousands of children already here who would love to have a family. I wish we could find ways to get those children into good families.