However, he delivered his speech, right in front of the 2,500 audience, as a hologram.
He therefore saved 15 tons of carbon instead of flying himself and his staff 11,260 kilometers.
The three-dimensional image of Charles was seen giving his address. He recorded the message at Highgrove and it was transformed into a hologram-style image using technology based on a Victorian music-hall technique called "ghosting".
A video projector beam the image of the Prince on the floor, then reflected on a foil to create the optical illusion.
Al Gore used similar technology to appear as a hologram at Wembley Stadium at the beginning of the Live Earth concerts earlier this year.
The Prince was attacked two weeks ago when he flew to the USA with 12 staff to receive an environmental award from Gore, estimated to create 20 tons of carbon dioxide.
However Prince Andrew - often called "Air Miles Andy" for zipping all over the world, was also at the Abu Dhabi conference.
Protocol forbids two physical Royals from being on the same stage, so it didn't breach that safety prerequisite. But a palace spokesperson said the protocol would need to be rewritten to take into account this technology.
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