Rep. Alexandria Ocasio-Cortez takes her friends’ worries seriously that it’s immoral to have children because of climate change. The freshman congresswoman, however, had only insults for a Sen. Mike Lee, R-Utah, when he suggested that having more babies would be good for the planet.

The gentlelady from New York is doubtlessly serious in her concern about climate change, and so we’d urge her and her party to drop the reflexive animosity and instead consider the argument Lee made, which has its roots in serious economics. If you believe we face serious threat from climate change and that mankind’s current trajectory is a disastrous one, you shouldn’t discourage people from having children. You should encourage them to be fruitful and multiply.