For above one hundred years . the nature forests have been felled on a large scale . On the one hand , the existent natural resource of timber forest is on verge of exhaustion . And there have been soil erosion , desertification . shortage of water resources, the frequent disaster of flood and drought, warming weather on the earth , ecological balance fast broken and so on . On the other hand , the demand for industrial wood is facing an supply severely deficit . In order to protect forests , to...
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