越来越多的人意识到保护环境的重要性可以翻译成

越来越多的人意识到保护环境的重要性可以翻译成more and more people realize that it is important to protect the environment.

高级一点的翻译：A growing number of people are recognizing the importance of environmental protection（注意：realize是意识到存在，而recognize意识到并承认或接受。本文的前提是越来越多的人意识到，隐含前提是承认和接受了！ 至于越来越多的人more and more比较low和口语一点，而a growing number of people 强调是一个累积的过程，相对本题跟客观；至于你后面的翻译也没有错，不过联系到前面的句子的生动性，用the importance of environmental protection则更流畅和生动）

more and more people have been realizing the importance of protecting environment.

可以，宾语从句。

More and more people have realized the importance of protecting the environment.