Meteorology and Climate Climatic change 22 Climate change 18 Pollution and Degradation 16 Plant Production 15 Climatic changes 14 Sustainability 13 more ... Climate 12 Water Resources 12 Environmental aspects 11 Environmental impact 11 Forests and Forest Trees (Biology and Ecology) 11 Plant Ecology 10 Plant Physiology and Biochemistry 10 Policy and Planning 10 Adaptation 9 Forests 9 Global warming 9 Natural Resource Economics, (New March 2000) 9 Food security 8 Plant Pests, (New March 2000) 8 Plant pests 8 Soil Chemistry and Mineralogy 8 Air pollution 7 Animal Ecology 7 Case studies 7 Crops and climate 7 Insects 7 Plant Breeding and Genetics 7 Plants 7 less ...