Related by context. Frequent words. (Click for all words.) 60 cerrado 55 biodiversity hotspot 55 acidic soils 55 cacao bean 55 transgenic corn 55 Amazonian rainforest 55 arid climates 53 biochar 53 absorbs carbon dioxide 53 Cerrado 53 methane CH4 53 loess 52 decaying vegetation 52 photosynthetic organisms 52 biodiverse 51 intensively farmed 51 annatto 51 Amazon basin 51 radiocarbon dated 51 soils 51 mycelium 51 deforest 51 agroforestry 51 deforested 50 inorganic fertilizers 50 arid lands 50 tannic acid 50 montane 50 manioc 50 lowland forests 50 acidify 50 cordgrass 50 resinous 50 carbonized 50 radiocarbon dates 50 rainforest 50 sooty mold 50 nitrogen fixation 50 middens 49 phyto 49 erosional 49 Amazon rainforest 49 cacao trees 49 vegetable dyes 49 sparse vegetation 49 Scientists theorize 49 prickly pears 49 vegetated 49 naturally occurring mineral 49 nitrogen fixing 49 soil salinity 49 semiarid 49 inorganic compounds 49 chicha 49 deforesting 49 Cyanobacteria 49 isoprene 49 atmospheric nitrogen 49 Rainforests 49 mud volcanoes 49 marine sediments 49 peat swamps 49 Amazon Rainforest 49 stromatolites 49 volcanic soils 49 Arctic permafrost 49 epiphytes 49 Biochar 49 Spanish conquerors 49 biodegraded 49 Inca Empire 49 terpenes 49 phytoremediation 48 Amazonian 48 microfossils 48 moringa 48 cherimoya 48 alkaline soils 48 drylands 48 rice husks 48 arid regions 48 biogenic 48 temperate forests 48 monocultures 48 bioenergy crops 48 hydrothermal vent 48 chilli pepper 48 teosinte 48 tropical forests 48 uncultivated land 48 Jatropha curcas 48 indigenous flora 48 fertile soils 48 deforestation 48 sequester carbon dioxide 48 artificial flavorings 48 tropical forest 48 Bagasse 48 jarosite 48 biodiversity hotspots 48 zeolites