The dual-degree profession should complete 60 credits, including48.5 compulsory credits, 11.5 elective credits.
修读本专业双学士学位必须完成60学分，其中必修48.5学分，选修11.5学分。
For the moment the main compulsory market, Europe's emissions-trading scheme, does not accept forest-carbon credits.
目前，欧洲排放交易体系这一主要的强制性市场并不承认森林碳信用额。
Compulsory general education courses 60 credits;
通识教育必修课60 学分；
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