Prince Charles cut his carbon emissions by 9 percent last year and now runs a carbon-neutral household, a review of the heir to the throne's accounts said Tuesday.
The eco-friendly prince's emissions were calculated at 3,425 metric tons (3,775 tons) of carbon dioxide in 2006-2007, the report said.
It said the prince had reduced the number of plane and helicopter journeys he takes, introduced green electricity at his Highgrove country estate in western England and converted his fleet of official Jaguar and Land Rover vehicles to biodiesel fuel.
The report said the prince's household — Highgrove, where he farms organically, and homes at Clarence House in London and Birkhall in Scotland — and the activities of Charles and his wife Camilla, Duchess of Cornwall, were now carbon neutral.
The report said that assessment did not include official overseas travel before Jan. 1.
The report also said the prince's private income from his Duchy of Cornwall properties rose from 14 million pounds in 2005-2006 to 15.2 million pounds ($30.4 million) in 2006-2007.