It is true that protecting environment is a popular issue in these days. However, it is argued that that only politicians be in charge of this duty, I totally disagree with this opinion and I strongly believe that environmental preservation is the responsibility of every inhabitant including the officials.

On the one hand, every meaningful activity of an individual would contribute to protecting the habitat. It is undeniable that the politicians account for a small number of citizens. Therefore, environmental conservation could not be well done if it is merely contributed by actions taken by the authority. Every resident might do some habits such as collecting litters, throwing the garbage in the required landfill or stopping poaching endangered animals. Consequently, the outcome could be promising in saving the natural world and the surroundings.

On the other hand, there is no doubt that the government play a vital role in environmental conservation. They do the public relations domestically and internationally in order to raise funds for some work such as constructing the waste or polluted water systems or installing several clean energy machines in the industrial areas. Moreover, thanks to the policies and the banning laws namely financial sentence for any individuals or organisations dumping water, waste or harmful smoke improperly. As a result, the atmosphere could be improved and the living surroundings no longer do harm to inhabitants.

In conclusion, it is certainly true that every appropriate step should be done not only by the politicians but also the civilians so as to save the Earth, the environment.

I think the essay in places reflects a misunderstanding of the question, which uses the term "politicians" to mean government, as opposed to individual citizens. Only government can make and enforce rules and regulations to protect the environment, and thus influence the behavior of citizens in general. One individual, or one manufacturer may take steps to protect the environment, but another may not, leaving the rest of the community to clean up afterwards.

"Environment" is most commonly preceded by a definite article, as there is only one under consideration, in much the same way as we say "the moon'"

It is true that protecting [missing article] environment is a popular ["popular" refers to something good: here the issue may be much debated but it is essentially because of its bad state. ] issue in [no preposition required] these days. However, it is argued [By whom?] that that only politicians be in charge of this duty [only government has the power to enforce change], [comma-splice] I totally disagree with this opinion and I strongly believe that environmental preservation is the responsibility of every inhabitant including the officials. ["the officials" makes it sound as if you are referring to their behavior in their private lives, whereas the contrast required is with government as a ruling body and entity. ]

On the one hand, every meaningful activity of an individual would [Do you mean "should"?] contribute to protecting the habitat. [An odd idea: do you mean everything I do must only be directed toward environmental protection? I have to eat and sleep as well. ] It is undeniable [Well, I could deny it. ] that the politicians account for a small number of citizens. [So what? How does the number of politicians affect the issue. It is the power of government that is pertinent. ] Therefore, environmental conservation could not be well done if it is merely contributed by actions taken by the authority. [But government needs to lead the way and set an example in its own operations, public works, and public sector activities. ] Every resident might do [wrong verb] some habits such as collecting litters, throwing the garbage in the required landfill [I thought the objective was zero landfill: do you proper bin/trash can.]or stopping poaching endangered animals. [Are you implying that every resident is poaching endangered species? If not, then how can they stop?] Consequently, the outcome could be promising in saving the natural world and the surroundings. ['surroundings' is not an equivalent of the environment here. Sometimes 'ecosystem' is appropriate.]

On the other hand, there is no doubt that the government play [verb ending] a vital role in environmental conservation. They do the public relations domestically and internationally in order to raise funds for some work such as constructing the waste or polluted water systems [Why are they building polluted water system; why not clean it up instead?] or installing several clean energy machines [What is a clean energy machine? Be more specific] in the industrial areas [Which industrial areas are you referring to? None have been specifically mentioned so far.]. Moreover, thanks to the policies and the banning laws [bans] namely financial sentence [fines] for any individuals or organisations dumping water [Dumping water? What is wrong with that?], waste or harmful smoke ["emitting" smoke] improperly. As a result, the atmosphere could be improved and the living surroundings [air pollution] no longer do harm to inhabitants.

In conclusion, it is certainly true that every appropriate step should be done not only by the politicians but also the civilians [Politicians are civilians] so as to save the Earth, and the environment.

There is an essay on roughly this topic here:

https://ielts-simon.com/ielts-help-and-english-pr/2010/08/ielts-writing-task-2-full-essay.html