Abstract
Since 1984, when global observations of terrestrial vegetation were first made using the Advanced Very High Resolution Radiometer (AVHRR), Earth scientists have developed a host of new techniques for studying the biosphere. Many recent papers have used the Normalized Difference Vegetation Index (NDVI) to quantify large‐scale changes in global vegetation from the early 1980s through the present. Global NDVI time series data have even provided evidence that spring vegetation growth is occurring earlier and enhancing the carbon sink of temperate latitudes in the Northern Hemisphere
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