In an interview with Elle, Miley explained that her reason for not wanting kids was largely environmental.
"We’ve been doing the same thing to the earth that we do to women. We just take and take and expect it to keep producing. And it’s exhausted. It can’t produce. We’re getting handed a piece-of-shit planet, and I refuse to hand that down to my child. Until I feel like my kid would live on an earth with fish in the water, I’m not bringing in another person to deal with that."