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> I've also heard people say that humans are not the cause of climate change. Just because people say something doesn't mean it's true.

This is a straw man argument, you're comparing regular science with philosophy.

> Nirvana is not a natural state

> It is an artificial state that humans have invented

> we have to make Nirvana. We have to design it and build it and maintain it

Sorry, but you have incorrect understanding of this concept in terms of both Buddhism and Hinduism. Please update your information on this topic.