波里·亚克和其合作者为美国气候变化科学计划精心准备了论文和报告，他是第一作者。
Polyak is lead author of the paper and a preceding report that he and his coauthors prepared for the U.S. Climate Change Science Program.
这份报告是美国气候变化科学计划的一部分，这份计划整理了全美国联邦在这个课题上的研究。
The report is part of a series by the US Climate Change Science Program, which collates all US federal research on the subject.
报告指出，碳抵消计划的问题在于，它减少的温室气体比科学家所说的避免灾难性气候变化所需的量要小的多。
The problem, said the report, is that offset schemes are delivering much lower greenhouse gas cuts than the science says are needed to avoid catstrophic climate change.
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