JK Rowling is going green for the next instalment in the Harry Potter series.
The sixth book about the boy wizard will be printed on environmentally-friendly paper.
JK is among a group of writers - also including His Dark Materials author Philip Pullman - who have agreed to start using recycled paper.
So far, the Harry Potter books have used up a whopping 6.5 million trees. At present, no major UK book publishers use 100% recycled paper.