Ecosystems & Habitats 9 Forests & Rainforests NATURE 9 Plants 6 Trees 6 Forest ecology 3 Forests and forestry 3 General 3 Ecology 2 Environmental Conservation & Protection 2 HISTORY 2 State & Local 2 Agriculture 1 BIOGRAPHY & AUTOBIOGRAPHY 1 Chaparral 1 Chaparral ecology 1 Ecologists 1 Ecosystems 1 Effect of fires on 1 Effect of human beings on 1 Environmental Science 1 Fire ecology 1 Forest canopies 1 Forest canopy ecology 1 Forest conservation 1 Forest management 1 Forest policy 1 Forestry 1 Forests 1 Forstberuf 1