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『英語で読む高校世界史　Ｊａｐａｎｅｓｅ　ｈｉｇｈ　ｓｃｈｏｏｌ　ｔｅｘｔｂｏｏｋ』

　From the beginning, civilizations were created being independent of or in conflict with, the natural environment.　Therefore, they could spread beyond the difference of environments. On the other hand, cultures were the lifestyles made by the relations between humans and natural environments. In other words, each area has its own culture suitable for its environment. Relationships between humans and nature have made unique landscapes. It is difficult for a culture to spread beyond its own environment. Thus, the cultures were thought to be inferior to the civilizations. Since the end of the 20th century, however, the meaning of natural environments began to be reconsidered.

http://d.hatena.ne.jp/d1021/20170425#1493116698（講演 94:06）
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