上世纪90年代，许多经济学家开始将混沌理论视为一种提供预测模型的方法。
In the 1990s, many economists began to look at chaos theory as a way of providing models for forecasting.
税收也可以作为环境保护的一个重要工具。许多经济学家认为，征收碳税会是减少温室气体排放的最佳途径。
Taxes can also be an important tool for environmental protection, and many economists say taxing carbon would be the best way to reduce greenhouse gas emissions.
复苏的力度另许多经济学家吃惊。
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