Are you in an industry where you can get your hands on waste from wood streams? These can be used wooden pallets, saw mill waste or debris from land-clearing. You can make money by creating mulch out of these waste collection.
Don't know how? Amerimulch, a company selling colorant and equipment for producing mulch has a write up on the processes. If you think this is feasible, then check out their profitability chartsto see how much you can expect to make out of this mulching business.
Don't forget that there are also other ways to make money out of abandoned wood, especially if they are old solid hardwood. I have covered that in my earlier posting, "Something Old? Before you chuck, check this out".