Opting out from catalogs - reduce junk mail
Catalog Choice is an easy, free service that allows you to decline unsolicited catalogs, reducing the number of catalogs in your mailbox and the number of trees that get sent to the paper mill.
I don't get a lot of catalogs because I wrote to the Direct Mailing service to take me off their lists, but I still get some (including double from Pottery Barn). I signed up yesterday and opted out of 17 total.
They don't sell your email to anyone else.
Here is a link that might be useful: Catalog Choice