This is a regional thing [0] though. We need to plant the trees in Latin America, Caribbean, and Sub-Saharan Africa. The rest of the world is gaining forests.

[0] http://www.telegraph.co.uk/news/2016/03/23/deforestation-whe...

Now, the question is, which industry sector cuts the largest percentage of trees. Now, answering that question, is there a way to do the same thing without cutting trees?

Answering that question and then executing a business plan is probably worth billions.

Planting trees to combat 6 billion trees lost every year is a pure expense, no profit to be made at all. At least not if you won't cut them down a few decades later.