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１９９２年在联合国召开世界发展与环境大会上通过了《２１世纪议程》、《森林原则声明》等文件，森林问题成为世人关注的热点。１９９７年２月召开的防止全球温暖化京都会议对作为二氧化碳吸收源与炭库的森林作用给予高度评价。另一方面，随环境意识的提高，消费者，特别是发
In 1992, at the United Nations Conference on World Development and Environment, “Agenda 21” and “Forest Principles Statement” were adopted and the issue of forests has become a hot spot of concern to the world. The Kyoto Conference on Preventing Global Warming, held in February 1997, gave a high evaluation of the role of forests as sources of carbon dioxide and carbon deposits. On the other hand, with the improvement of environmental awareness, consumers, especially fathers