While many good and useful claims are being made, it is clear there is a long way to go in ensuring shoppers are adequately informed about the environmental impact of the products they buy.

　　分析主干：it is clear that...

　　句首的While 引导让步状语从句， 尽管 ......。it is clear......中，it 是形式主语，省略连接词that 的从句there is...才是句子的真正主语。in ensuring...是there be 句型的状语成分， 在确保......方面 。ensuring 后面接的是省略that 的宾语从句。

　　译文：虽然有许多好而有用的声明，但是，很明显，要确保购买者完全知晓所购产品对环境的影响还需要很长的时间。