throw less away

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china chinese
I met a setence which puzzled me a lot. Now I copy it in pink, and hope you can explain it to me. Thank you in advance!
Why do we need to throw less away? There are two reasons. One is that some resources (资源) are nonrenewable (不可再生的) That means there is only a certain amount of that resource in the world . One example of this is oil. When we use up all the oil in the world, there will be no more.
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