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Prince Harry and Meghan Markle aren’t planning on having a big royal brood.

In an interview for British Vogue, Harry, 34, revealed he only wants two children at most — as he spoke about his concerns for the planet and the “terrifying” effects of climate change.

The Duke of Sussex, who is sixth in line for the British throne, interviewed primate-expert Jane Goodall for the mag’s September issue, which was guest-edited by Markle, 37.

When discussing the earth’s shrinking resources, Harry said: “What we need to remind everybody is: these are things that are happening now. We are already living in it… Which is terrifying.”

The 85-year-old anthropologist asked if Harry’s attitude toward the planet had changed since he became a dad, to Archie in May.

“It does make it different,” he replied. “I think, weirdly, because of the people that I’ve met and the places that I’ve been fortunate enough to go to, I’ve always had a connection and a love for nature.

“I view it differently now, without question. But I’ve always wanted to try and ensure that, even before having a child and hoping to have children…”

Goodall interjected: “Not too many!”

“Two, maximum!” Harry responded. “But I’ve always thought: this place is borrowed. And, surely, being as intelligent as we all are, or as evolved as we all are supposed to be, we should be able to leave something better behind for the next generation.”

Harry’s outlook on family is a stark contrast to his brother — and to the royal matriarch, Queen Elizabeth II.

Prince William and his wife Kate Middleton already have three kids: Prince George, Princess Charlotte and Prince Louis.

The Queen has four children, although all of her kids only have two.

In his interview with the conservationist, the prince also brought up racism and “unconscious bias,” saying some people don’t realize their own prejudices are inherited.

“Despite the fact that if you go up to someone and say, ‘What you’ve just said, or the way that you’ve behaved, is racist’ – they’ll turn around and say, ‘I’m not a racist’,” Harry said.

“I’m not saying that you’re a racist,” he continued. “I’m just saying that your unconscious bias is proving that, because of the way that you’ve been brought up, the environment you’ve been brought up in, suggests that you have this point of view – unconscious point of view – where naturally you will look at someone in a different way.”

The prince has previously criticized British tabloid coverage of his former TV-actress wife, whose mother is African-American and whose father is white, as having racist overtones.

“Just as stigma is handed down from generation to generation, your perspective on the world and on life and on people is something that is taught to you,” said Harry. “It’s learned from your family, learned from the older generation, or from advertising, from your environment.”