People who do not consider it necessary to reduce the use of disposable products.

分析：此句话错误，这句话是who 引导的定语从句，缺乏主句。

There are many people who do not consider it necessary to reduce the use of the use of disposable products. 给此句子加一个完整的主句就构成了符合语法结构的主从复合句。