The NASA/USGS Landsat satellite mission has tracked world vegetation levels over nearly four decades and is helping scientists study how the Amazon rainforest has changed over that time. The Amazon is the largest tropical rainforest in the world, but every year, less of that forest is still standing. Today’s deforestation across the Amazon frontier is tractors and bulldozers clearing large swaths to make room for industrial-scale cattle ranching and crops. NASA’s Landsat data is available online at the Earth Resources Observation and Science (EROS) Center.





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