Amazon Vegetation Response to Drought (image) University of Texas at Austin Caption During the 2005 and 2010 droughts, satellites detected decreased vegetation greenness -- or a lower Normalized Vegetation Index (NDVI) -- over the southern Amazon rainforest (orange and red regions). NDVI is derived from MODIS instruments on NASA's Terra and Aqua satellites. Credit Image courtesy of Ranga Myneni, Jian Bi and NASA. Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.