Combining measurements of changes in forest area with estimates of carbon stock densities enables estimation of emissions from deforestation or forest degradation over large regions, and with the updated version of the IPCC GPG-LULUCF, methods are available for estimating carbon emissions from deforestation at national and project scales (DeFries et al. 2007).
There are two fundamentally different, but equally valid, approaches to estimating carbon stock changes (Brown and Braatz 2008, see Figure 2): the stock-difference approach, and the gain-loss approach.
Stock-difference approach. This method estimates the difference in carbon stocks in a particular pool10 at two moments in time. It...