Some scientists believe that the rise in carbon levels means that the Amazon and other rain forests in Asia and Africa may go from being assets in the battle against rising temperatures to liabilities.
出自-2013年6月閱讀原文
柯林斯高階英漢雙解學習詞典釋義
N-COUNT
累贅；負累；負擔
If you say that someone or something is a liability, you mean that they cause a lot of problems or embarrassment.