I finally broke down and bought a 3-point hitch chipper to deal with the brush piles. I originally figured we'd use the chips for mulch and compost and trail cover, but I found myself looking at this big pile of biomass, and one thing led to another..... My chips aren't really green - they're a mix of green, dry, and way past dry into punky. There's a Christmas tree in there somewhere, poplar branches, white and red cedar, white pine, buckthorn, and anything else that looked chippable (honey, where's the cat?) Bottom line: I'm amazed at how well they work. You have to have a *good* bed of coals, but they burn hot and clean with *no* puffing. I wish I could figure out a reasonable way to store and handle them.