In Canada, there is the Red Dot that is supposed to work:
Red Dot Campaign | Now Say NO to Junk Mail
However, I found out about this two late. I had already re-delivered my junk mail to the post office, stalked the mail carrier, and called local free newspapers and threatened to collect all the newspapers on my street and dump them on their doorstep.

It worked. I now only receive mail that is actually addressed to me. It's not perfect, but at least I'm not getting all those flyers and stuff that just go straight into the recycle bin.
The post office actually complained to ME though, and said that AdMail is how they make their money. Who else here is willing to pay more postage to keep the garbage out of our homes and landfills?