We used the annual (2002-2017) forest probability maps from Tong et al (2020) which were also derived from MODIS data. A probability threshold of 0.5 was used to define if an area is a forest or not (Tong et al., 2020). We identified three types of forests (Fig.1): (1) old forests (always forest during 2002-2017), (2) new forests (no forest in 2002 but in 2017), and potential forests (never forested during 2002-2017).