Vegetation 180 Research & information: general 166 Biology, life sciences 140 China 121 Ecosystems 114 Climate change 88 Forestry 80 Technology: general issues 78 Remote sensing 73 NDVI 63 climate change 61 Indicator indicator 50 remote sensing 49 Biodiversity 48 Land use 48 Research and information: general 48 spatiotemporal analysis 46 History of engineering and technology 44 human 43 Ecology 39 TJ Mechanical engineering and machinery 39 Humans 37 Soils 37 Landforms 35 Normalized difference vegetation index 33 TA Engineering (General). Civil engineering (General) 33 Wetlands 31 United States 30 biodiversity 30 vegetation dynamics 30