The question is whether the projects need the credits to be economically feasible, said Lex de Jonge, chairman of the executive board of what is known as the U.N.

• 联合国清洁发展机制(CDM)执行理事会主席德容格(LexdeJonge)说，问题在于这些项目是否需要碳信用才能达到经济可行性。