'There is a stigma about coal because of its historical environmental and safety concerns, ' says Edward Glatzer, director of technology at Nexant Inc., a San Francisco-based consulting firm.

美国咨询公司Nexant Inc.的技术主管爱德华•格拉泽(Edward Glatzer)说，因为人们在环境和安全方面一直对煤炭心怀疑虑，所以煤炭的名声不怎么好。

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Most of the current market for plant-based chemicals and polymers lies in specialty chemicals used in soaps and detergents, says consulting firm Nexant in White Plains, N.

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