The short answer, I don't know. When they cleared New England they used to burn the stumps out. The Indians used to set large fires to maintain grazing land for the buffalo herds, so I've read. Part of me says we have a lot of land in this country that isn't being utilized, a lot of land that has grown back up with brush and trees as well. I can't count the number of times I've found old barbed wire fences in the woods that were likely a pasture at one point, granted that people used to fence their property with it. I think there are things we can do to change our direction and compete, first thing is to study the New Zealand model and get the government out of the business of keeping agriculture afloat. It's a touch situation because there are issues with Natioanl Security and self dependency with the food supply. I'm not totally convinced clearing the land down there is a bad thing, the methods could be argued, but how is it differnt then our ancestors settling this country? If you are worried about the environmental impact, expose it, get pictures. Compare to how we do it, educate the customer. With COOL labeling people can have a choice.