Some young people are hesitant to start a family because they are worried about the impact it will have on the environment.
But some experts argue, there are good reasons to still consider having children.
One of them is Dean Spears.
He's an economist and demographer at the University of Texas - Austin, and co-author of the new book, "After the Spike: Population, Progress, and the Case for People."
Spears argues that depopulation could create a whole range of new problems while still not addressing the driving forces of climate change.
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