But most of us just don't have the room to keep them all.
Some quite simply have to go.
What do you do with all those unwanted paperbacks?
You know the sort, the ones that keep you entertained but you'll never read them again.
Well Green Metropolis offers one solution :
"Books can’t be recycled in the same way as newspapers and magazines, however, they can be recycled in a very sustainable way! You simply need to ensure that they stay in circulation by finding them a new home. By doing this you're not only helping the environment, you're also increasing the pleasure a good book can give and doing your bit for charity - for every book sold, we donate 5p to the Woodland Trust!"
Take a look at the Green Metropolis website.