The problems that are created by environmental contamination is very hard to resolve.什么错

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The problems that are created by environmental contamination is very hard to resolve.什么错
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The problems that are created by environmental contamination is very hard to resolve.什么错
The problems that are created by environmental contamination is very hard to resolve.什么错

The problems that are created by environmental contamination is very hard to resolve.什么错
is→are

change "is" into "are", 因为主语是复数。