The Duke of Sussex was reportedly warned against taking a private flight to Sicily to attend a Google climate change conference in July. But Harry ignored the advice and took the jet despite being an eco-warrior.
A source told the Daily Mail: “It came back to bite him – badly.”
Harry gave a barefoot speech on saving the planet to a crowd of celebrities at the Google event.
However, the move raised eyebrows as Italian newspaper Giornale di Sicilia reported that 114 private planes carrying VIP guests to the conference landed at Palermo, the nearest airport.
Over the summer, Meghan Markle and Harry prompted a backlash for taking four private jets in 11 days to luxury holidays in Ibiza and Nice.
The Sussexes opted to take exclusive flights despite regularly preaching to the public on being green.
Harry and Meghan took their son Archie to Spain for Meghan’s 38th birthday in August, before heading to France for a holiday at Sir Elton John’s home.
Their decision to travel by private jet prompted accusations of hypocrisy.
It was also in contrast with the Duke and Duchess of Cambridge who were spotted taking a commercial flight to Scotland with their three children to visit the Queen in Balmoral.
It came after Harry announced in the September issue of Vogue, which was guest-edited by Meghan, that they would have a maximum of two children to help save the planet.
He also spoke about the “terrifying” effects of climate change, saying: “What we need to remind everybody is: these are things that are happening now.
“We are already living in it… Which is terrifying.”
In June Meghan and Harry warned their followers on Instagram that “there is a ticking clock to protect our planet”.
The royal couple added: “We are jeopardising this beautiful place we call home – for ourselves and for future generations. Let’s save it. Let’s do our part.”
Harry also said that “every choice, every footprint, every action makes a difference” to help the environment.
Meghan and Harry are currently on a 10-day tour of Africa after a year of bad publicity.
The pair have faced persistent rumours of a rift with Prince William and Kate, spent £2.4million of taxpayers money on renovating their home Frogmore Cottage and upset royal fans by keeping Archie’s birth and christening secret.