Human activity Biological Resources (Plant) 2 Ecological disturbance 2 Forests 2 Forests and Forest Trees (Biology and Ecology) 2 Nature conservation 2 Plant Ecology 2 Pollution and Degradation 2 Silviculture and Forest Management 2 Sustainability 2 Air pollution 1 Biodiversity 1 Carbon cycle 1 Climatic change 1 Decision making 1 Deforestation 1 Encyclopedia 1 Environmental management 1 Environmental protection 1 Ethnic conflicts 1 Forest Fires 1 Forest biodiversity 1 Forest biodiversity conservation 1 Forest ecology 1 Forest fires 1 Forest fragmentation 1 Forest management 1 Forest pests 1 Forest resources 1 Forestry practices 1