为什么作者说美国农业部本可以通过制定膳食指南从而在应对气候变化方面做出很大贡献？
Why does the author say the USDA could have contributed a lot to lowering the climate cost through its dietary guidelines?
在科学应对气候变化方面我们角色很重。
We are already playing a big part in the science of climate change.
我们在应对气候变化方面的合作尤其重要。
Our cooperation in the fight against climate change is particularly important.
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