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It looks like it might be a case of 'Anything you can do, I can do better' for brothers Prince William and Prince Harry.

Following on from the news that 36 year old Harry is set to write a tell-all memoir revealing all the details of his and Meghan Markle's exit from the Royal family, his elder brother William, 39 has revealed he had also contributed to a book.

Earshot: How to Save Our Planet is set for publication on September 30 and features an introduction by the William.

Interestingly, news of William's new venture comes shortly after his brother Harry revealed that he was set to publish a memoir in which he has promised to share "mistakes and lessons learned" and be "wholly truthful" about the "highs and lows" of his life.

The news of Harry's plans is thought to have come as a shock to his father prince Charles and the Queen as well as William, and there is said to be "growing disquiet" at Buckingham Palace about the situation.

It is thought that the Duke of Sussex has been secretly working on the book for nearly a year and has sold the rights to Penguin Random House for a reported $20m, which he has pledged to donate to charity.

In a rare move for a senior member of the royal family, it's thought Harry has been working with a ghost writer but a first draft is set for submission by October.

While William's publishing effort sounds much less contentious, it's the timing of the announcements that is interesting with Kensington Palace releasing details of the Duke of Cambridge's plans to the press just the day after the Duke of Sussex revealed his.

Earthshot: How to Save Our Planet is being lauded as a once in a generation publishing event with an exclusive introduction with keen conservationist Prince William.

The prize which inspired the name of the book was launched by William in 2010 with the aim of discovering the best solutions to help repair our planet over the next ten years.

The book will be published alongside a landmark 5 part BBC series produced by the brains behind David Attenborough's a Life on Our Planet.

William and Harry's relationship has become increasingly contentious since Harry and his wife Meghan's decision to step down as senior members of the royal family, relocate to the US and do a tell all interview with chat show host Oprah Winfrey.

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