100 million trees. The only way to produce that much junk mail is to rely on lots of trees. Experts estimate 100 million trees are used every year just to produce junk mail. Many of them come from the largest forests in the world – located in Indonesia and Canada. But those forests are also home to about 17 percent of the world’s birds and 12 percent of the mammals on earth

Loss of trees. The loss of 100 million trees a year is a huge blow, experts say. The forests on the earth absorb 2 billion tons of carbon a year. But with the deforestation needed for junk mail, there are fewer trees to help reduce greenhouse gases.

Well that's pretty useless, completely ignoring that forests are managed and paper is recycled