The Duke and Duchess of hypocrisy - Harry and Meghan burned nearly 10 TONS of CO2 by flying to Caribbean on private jet

Harry and Meghan also made a four-hour hop between the exclusive retreat and Atlanta in Georgia.

The visit comes after the pair attended a conference organised by Project Healthy Minds.

WATCH NOW: Prince Harry and Meghan Markle accused of hypocrisy

Zak Williams, the son on iconic actor Robin Williams, told attendees climate change was adversely impacting mental health, particularly among young people.

The Duke and Duchess have been keen to stress their support for tackling climate change in the past.

However, the couple have also previously received criticism and been accused of hypocrisy.

Harry and Meghan faced scrutiny for racking up four flights by private jet in the space of just 11 days, including one to Sir Elton John’s home in Nice.

Flights on private jets tend to emit more fuel per passenger than commercial journeys.

During a visit to the University of the South Pacific campus in Suva in 2018, the Duke of Sussex lectured attendees on the threat of climate change.

He said: “One of the greatest challenges is undoubtedly climate change and all of you living here are confronted with this threat in your daily lives you're actually experiencing changing weather patterns ferocious cyclones and rising sea levels particularly in places such as Tuvalu and Carib us.”

A joint statement from the couple a year later doubled-down on their calls to tackle climate change.

It said: “There is a ticking clock to protect our planet - with climate change, the deterioration of our natural resources, endangerment of sacred wildlife, the impact of plastics and microplastics, and fossil fuel emissions, we are jeopardising this beautiful place we call home - for ourselves and for future generations.”

The statement added: "Let’s save it. Let’s do our part. Environmental damage has been treated as a necessary by-product of economic growth.

"Only now are we starting to notice and understand the damage that we’ve been causing.

“With nearly 7.7 billion people inhabiting this Earth, every choice, every footprint, every action makes a difference.”

Prince Harry continued to echo such remarks during his speech to the United Nations last year, describing climate change as “wreaking havoc on our planet” and warning it put the “most vulnerable” at the most risk.

It has been claimed that the Sussexes' 4,000-mile journey burnt a whopping 9.6 tonnes of carbon dioxide.

An insider claimed the Duke and Duchess flew on a Falcon 7C which belonged to his friend who has as a property on Canouan.