Brand new company, great business model.
greendimes removes you from the mailing lists that leave you knee-deep in junkmail and credit card solicitations. $3 a month for a personal account, and $6 for a small business. And they promise to plant trees in your name!
Yes, you can do this for yourself. The Direct Marketing Association will remove you from the mailing lists of reputable marketers. It's quirky; you pay $1 and reregister every 5 years. This won't take you off the credit card solicitation lists -- for this, you call 1-888-5OPT-OUT.
And as to planting a tree? With a brown thumb and NYC apartment, for me this is one of those "Kids, please don't try this at home" endeavors.
They tell me of plans to establish a rewards program for customers who refer business, along the lines of Amazon.com's Associates Program. But you won't find this info on the greendimes website: I wrote to ask the question, and got a note back from the CEO. (It is a start-up!)