Related by context. Frequent words. (Click for all words.) 63 Climate Change 56 Climatology 56 Climate 55 Climate Change IPCC 54 Changing Climate 53 Biodiversity 53 Unep 53 Global Warming 53 Combat Desertification 53 Climate Change Adaptation 53 climate change 53 Sustainable Development 52 Greenhouse Gases 52 Climate Change Secretariat 52 Greenhouse Gas Emissions 52 Geophysical Research 52 Coral Reefs 52 TEEB 51 Ecosystems 51 Geoengineering 51 UNEP 50 Article PubMed ISI ChemPort 50 UNFCCC 50 Climate Impact Assessment 50 Millennium Ecosystem Assessment 49 anthropogenic climate 49 Environment Programme 49 Environmental Pollution 49 gigatonnes 49 Greenhouse Gas 49 Article PubMed ChemPort 49 Nature Geoscience 48 Worldwatch 48 Applied Ecology 48 Biodiversity Conservation 48 Desertification 48 Biological Diversity CBD 47 journal Nature Geoscience 47 Sustainable Tourism 47 REDD + 47 Copenhagen Climate 47 Disaster Reduction 47 Climatic 46 ENSO 46 Copenhagen Consensus 46 GHG reductions 46 global warming 46 Astrobiology 45 Environment Facility GEF 45 Environment Programme UNEP 45 greenhouse gases GHG 45 ocean acidification 45 CO2 Emissions 45 journal Geophysical Research 45 journal Geology 45 Parties COP 45 World Meteorological Organisation 45 Cell Stem Cell 45 glacial melting 45 greenhouse gas concentrations 45 Position Paper 45 Fossil Fuels 45 Environment 45 WBCSD 45 Geochemistry 45 GHG emission 45 transboundary 45 #:#-# [001] 45 Finnish Meteorological 44 Program UNEP 44 Hydrological 44 Carbon Reduction 44 Carbon Emissions 44 tropical deforestation 44 Climate Change UNFCCC 44 gigatons 44 Emissions Trading 44 decadal 44 Carbon Dioxide 44 Deforestation 44 Organic Farming 44 Political Economy 44 Biochar 44 CLIMATE CHANGE 44 biodiversity 44 Hydrogen Economy 44 UNU 44 floods droughts 44 terrestrial ecosystems 44 Critical Issues 44 Pielke 43 ocean acidity 43 Soil Science 43 Bjorn Lomborg 43 atmospheric concentrations 43 species extinctions 43 World Meteorological Organization 43 IUCN 43 ozone depletion 43 Conservation Biology 43 Urbanization