The Prince of Wales has renewed his call for global action on man-made climate change, describing it as the "wolf at the door".
A long-standing and vocal campaigner on the issue, Charles said steps "must be urgently scaled up, and scaled up now".
The Prince issued the plea in his new Ladybird book on climate change co-authored with former Friends of the Earth director Tony Juniper and Emily Shuckburgh, a climate scientist at the British Antarctic Survey.
In the foreword, Charles states: "I hope this modest attempt to alert a global public to the 'wolf at the door' will make some small contribution towards encouraging requisite action; action that must be urgently scaled up, and scaled up now."
The book comes as America ushers in a president who has labelled climate change a hoax by the Chinese to undermine US manufacturing and pledged to pull out of the world's first comprehensive climate treaty, the Paris Agreement.
In 2012 Donald Trump tweeted: "The concept of global warming was created by and for the Chinese in order to make US manufacturing non-competitive."
A year later he wrote: "Ice storm rolls from Texas to Tennessee - I'm in Los Angeles and it's freezing. Global warming is a total, and very expensive, hoax!"
Charles's guide, published by Penguin, is based on the books for children created in the 1960s and 1970s.
The rebooted format features tongue-in-cheek titles for adults such as The Mid-Life Crisis, The Hipster and The Hangover.
However the Prince's guide, which carries an illustration of people escaping rising floodwaters in Uckfield, West Sussex, in 2000 on its cover, is not so frivolous.
The book explains the history, dangers and challenges of global warming and explores possible solutions with which to reduce its impact.
Mr Juniper said the Prince insisted the text was peer-reviewed for rigour and he remained "deeply involved at every stage".
"He wanted to present something everybody can read that cuts through some of the deliberately confusing misinformation that's been put out there over the years, which I know he is very frustrated about," he told the Daily Telegraph
A spokesman for Charles said climate change "is the thing he is most concerned about".
"He regards climate change as the number one threat to the planet and it is the thing he cares most passionately about," a spokesman told the Telegraph.
:: Climate Change (A Ladybird Expert Book) is published on January 26.