What are the facts about junk mail? You can study them at donotmail.org. Here are a few compelling items:

It takes more than 100 million trees to produce the total volume of junk mail that arrives in American mailboxes each year—that's the equivalent of clearcutting the entire Rocky Mountain National Park every 4 months. The manufacture of junk mail releases more greenhouse gas emissions per year than the emissions released by 9,372,000 million average passenger cars. Entire households only average 1 personal correspondence each week, compared to almost 18 pieces of junk mail. A response rate of less than 0.25% is considered acceptable for the 500 million U.S. credit card solicitations that are mailed monthly.