Climate change 15 Take urgent action to combat climate change and its impacts 9 Cambio climático 8 Drylands 6 Biodiversity 5 Carbon sequestration 5 Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss 5 Extremophiles 4 Global change 4 Mineralization 4 Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss 4 Biogeography 3 Carbon cycling 3 Ecosistema mediterráneo 3 Fungi 3 Global scale 3 Habitability 3 Materia orgánica 3 Phosphorus 3 Pirólisis analítica 3 Quercus suber 3 Soil biodiversity 3 http://metadata.un.org/sdg/13 3 Alcornoque 2 Ammonium 2 AmoAgenes 2 Antarctica 2 Aridity 2 Astrobiology 2 Biogeochemistry 2