While there are many thousands of references in the literature to the importance of NTFPs, only a small proportion of publications proceed beyond general statements on use to quantify value in meaningful ways that support comparisons across products and sites. Despite this, some overall estimates of value have been attempted. Pimentel et al. (1997), for example, estimated very approximately that 90 billion USD worth of food and other NTFPs were harvested annually from forests and trees in developing countries. FAO’s latest (2010) Global Forest Resources Assessment (GFRA) provides more recently estimated (based on 2005 figures) but lower worldwide values of 19 billion and 17 billion USD annually for non-wood forest product- and woodfuel-removals, respectively, but the country data compiled for the GFRA were acknowledged to be far from complete (one problem is that many countries, when they do report value for NTFPs, only do so for the ‘top’ few species of commercial importance; FAO, 2010). In the 2010 GFRA, in most tropical regions the most important use for non-wood forest products was indicated to be as food.