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Each deforestation alert indicates a 30 by 30 meter area (around the size of two basketball courts) that has experienced a disturbance in the forest canopy, which indicates that trees in that area may have been lost or removed. The primary purpose of the GLAD alert system is to alert people to potential deforestation, but GLAD alerts also pick up additional disturbances such as rotation cycles in plantations, forest degradation from fires and storms, and natural changes like landslides and windthrows.
Hansen, Matthew C., Alexander Krylov, Alexandra Tyukavina, Peter V. Potapov, Svetlana Turubanova, Bryan Zutta, Suspense Ifo, Belinda Margono, Fred Stolle, and Rebecca Moore. “Humid Tropical Forest Disturbance Alerts Using Landsat Data.” Environmental Research Letters 11, no. 3 (2016): 034008. https://doi.org/10.1088/1748-9326/11/3/034008
Gross Forest Cover Loss is defined as the area of forest cover removed because of any disturbance, including both NATURAL and HUMAN-INDUCED causes.
Hansen, M. C., P. V. Potapov, R. Moore, M. Hancher, S. A. Turubanova, A. Tyukavina, D. Thau, S. V. Stehman, S. J. Goetz, T. R. Loveland, A. Kommareddy, A. Egorov, L. Chini, C. O. Justice, and J. R. G. Townshend. 2013. “High-Resolution Global Maps of 21st-Century Forest Cover Change.” Science 342 (15 November): 850–53
Since 2004, Onda Verde begins forest restoration and conservation projects, by planting up to almost 2 million trees all over the Baixada Fluminense and the state of Rio de Janeiro.