Deforestation concept and when a tree falls symbol with an old tree in a forest being cut down for development or fire wood as a symbol of the environmental damage and problems in the conservation of the rainforest as in the Amazon.

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生物學, 植物學, 砍, 醒豁, 空地, 观念, 守恒, 尖利, 破坏, 砍伐森林, 拆毁, 覆灭, 開發, 生態系統, 環境, 环保型, fallen, fall trees, 火灾损失, 樹林, 森林火灾, 森林培育, 通盘, 工业的, 行业, 集材, 木材, 经营, 造化, 高年, 论文, 组装, 烟霾, 齿髓, 雨林, 节约, 节省额, 象征, 材, 结构树, 躯干, 预警, 森林地带, 树林