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Prince Harry has added to the hot air at Google Camp — by giving a barefoot speech at the billionaire summer party in Sicily about the need to save the environment, Page Six has learned.

A source said the Duke of Sussex showed up at the super-secret three-day event to give an impassioned lecture about saving nature to a crowd of A-list celebrities and power brokers, many of whom arrived in gas-guzzling private jets and are staying on enormous mega-yachts.

The prince covered the same material he talked about in an interview with British Vogue this week, where he said he planned to have no more than two children with wife Meghan Markle, the source said.

“Two, maximum!” he told renowned British anthropologist Jane Goodall while chatting about the deterioration of the planet.

Up to 200 celebrities have descended on the island of Sicily, chartering 114 private jets to get there and tooling around on Maseratis between staying on mega-yachts worth up to $400 million, according to Italian press reports.

Sources said supermodel Naomi Campbell also gave a heartfelt speech Wednesday about her friend, late South African leader Nelson Mandela.

President Barack Obama was slated to attend and give a talk but was ultimately a no-show, sources told The Post.

The three-day event ironically is focused on climate change, but the world’s rich and famous will also discuss human rights, politics and online privacy.

It’s unclear how much time the attendees will spend discussing their own effect on the environment, with The Post calculating that their flights alone would pump at least 784,000 kilograms (864 tons) of CO2 into the air.

Local media reported the A-listers have “invaded” the island, clogging local roads with Masteratis, Ferraris and Porches, with celebrities photographed tooling around the island in gas-guzzling, high-end SUVs.

The billionaire creators of Google have invited a who’s who of A-list names — including President Barack Obama, Katy Perry, Naomi Campbell, Leonardo DiCaprio and Diane von Furstenberg — for the mega-party, now in its seventh year.