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ArticleUncovering Dynamics of Global Mangrove Gains and Losses 2023
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No results found.Supporting successful global mangrove conservation and policy requires accurate identification of anthropogenic and biophysical drivers of mangrove extent, yet such studies are scarce. We apply a hybrid methodology, combining existing remote sensing mangrove maps with local expert knowledge of vegetation and land use dynamics. We conducted stratified random sampling in eight subregions, and local experts visually interpreted over 20,900 plots using high-resolution imagery in Collect Earth Online. Similar to previous estimates, we found 147,771 km2 (±1.4%) of mangroves globally in 2020 and that rates of mangrove loss have decreased from 2000–2010 to 2010–2020, largely driven by South and Southeast Asia. Anthropogenic drivers of loss have shifted across subregions, with oil palm cultivation emerging in South and Southeast Asia and aquaculture in South America and Western and Central Africa, highlighting the need for ongoing monitoring and adaptable conservation efforts. Natural expansion outpaced natural retraction in both periods. This is the first global study uncovering land use drivers of mangrove decline and recovery, only made possible by collaboration with local experts. Key breakthroughs include successfully discerning spectrally similar anthropogenic from biophysical drivers, such as aquaculture from natural retraction, and creating data collection approaches that streamline visual interpretation efforts. -
Book (stand-alone)How much do large-scale and small-scale farming contribute to global deforestation?
Results from a remote sensing pilot approach
2023Also available in:
No results found.The study presented in this document expands on the work conducted during the Global Forest Resources Assessment (FRA) 2020 Remote Sensing Survey (RSS) and revisits the extensive dataset of areas where deforestation occurred over periods 2000–2010 and 2010–2018 to subclassify and assess deforestation drivers. Notably, considering the importance it would have in designing appropriate strategies for halting deforestation, the study assesses the share of agriculture-driven deforestation linked to small-scale and large-scale farming, both for cropping and livestock systems. The goal was not only to further characterize the global deforestation drivers in 2000–2018 but also to identify methods and tools that can help in exploring the deforestation drivers using Earth Observation – by adding more options to the original FRA RSS query and by trying to define subjective characteristics of the activities. -
Book (series)FRA 2020 Remote Sensing Survey 2022
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No results found.The FRA 2020 Remote Sensing survey is a global collaborative study of the Land use dynamic between the years 2000, 2010 and 2018 focused on forest and forest changes conducted by FAO. Through 34 physical and virtual workshops, more than 800 local experts from 126 countries and territories were trained, evaluated and incorporated into the FRA Remote Sensing focal point network. This unique network of remote sensing specialists collected 400.000 samples between 2019 and 2020, allowing us to derive the most updated, consistent and reliable land use statistics at global, regional and global ecological zone level.
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