The model is also capable of analyzing the impacts of setting aside vast tracts of land on the forest fringe around the world. In addition to this modeling work, he is engaged in empirical studies with biologists and students that measure the value of leaving many forests intact for recreation, wildlife, and nontimber forest products. For example, with Chuck Peters and Al Gentry, they did the first study to measure the value of nontimber forest products in the Amazon.
This model is also able to analyze the consequences of reserving extensive areas of land on the global forest fringe. In addition to this modeling work, he is engaged in empirical research with biologists and students that quantify the benefits of preserving many forests intact for leisure, wildlife, and non-timber forest products.