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One thing needs to change is to maintain the health of Earth. Children should be taught in school about the benefits of protect the Earth. Educator and elders should explain to them the importance of keep our Earth clean and healthily. At the same time, the ways of keeping Earth clean should demonstrate to them. For example, recycling papers can prevent trees being cut off from the forces. In order to have a clean and refresh air in city, trees are big helpers. I believe maintain the health of Earth should be one big issue to everyone. And it is important for everyone to taking action now, because this is the only one way that Earth can survive in the planet.
Comments  
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I have underlined some problem areas:

One thing needs to change is to maintain the health of Earth. Children should be taught in school about the benefits of protect the Earth. Educator and elders should explain to them the importance of keep our Earth clean and healthily. At the same time, the ways of keeping Earth clean should demonstrate to them. For example, recycling papers can prevent trees being cut off from the forces. In order to have a clean and refresh air in city, trees are big helpers. I believe maintain the health of Earth should be one big issue to everyone. And it is important for everyone to taking action now, because this is the only one way that Earth can survive in the planet.
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One thing has to improve is the health of Earth. Children should be taught in school about the why is the Earth is so important to them. Educators and elders should explain to them the importance of keeping our Earth clean. At the same time, the ways of keeping Earth clean should be lessons to them. For example, recycling paper can prevent trees being cut from the forest. In order to have clean and fresh air in the neighborhoods, trees are big helpers. I believe improving the health of Earth should be one big issue. And it is important for everyone to take action now, because this is the only way that Earth can survive.
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Better! I have underlined some remaining problem areas:

One thing has to improve is the health of Earth. Children should be taught in school about the why is the Earth is so important to them. Educators and elders should explain to them the importance of keeping our Earth clean. At the same time, the ways of keeping Earth clean should be lessons to them. For example, recycling paper can prevent trees being cut from the forest. In order to have clean and fresh air in the neighborhoods, trees are big helpers. I believe improving the health of Earth should be one big issue. And it is important for everyone to take action now, because this is the only way that Earth can survive.
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One thing has to improve is the health of Earth. Children should be taught in school about why the Earth is so important to them. Educators and elders should explain to them the importance of keeping our Earth clean. At the same time, the ways of keeping Earth clean should be taught to them as lessons. For example, recycling paper can prevent trees being cut from the forest. In order to have clean and fresh air, trees are big helpers. I believe improving the health of Earth should be one big issue. And it is important for everyone to take action now, because this is the only way that Earth can survive.

i do not know how to correct the highlighted sentences. please tell me.

thank you
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You have too many verbs. There should be only one main verb per clause.
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The health of Earth has to be improve immediately. Children should be taught in school about the importance of Earth. Educators and elders should explain to them the importance of keeping our Earth clean. At the same time, the ways of keeping Earth clean should be taught to them as lessons. For example, recycling paper can prevent trees being cut from the forest. In order to have clean and fresh air, trees are big helpers. I believe improving the health of Earth should be one big issue. And it is important for everyone to take action now, because this is the only way that Earth can survive.

How about it? anymore errors?
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The health of the Earth has to be improved immediately. Children should be taught in school about the importance of the Earth. Educators and elders should explain to them the importance of keeping our Earth clean. At the same time, the ways of keeping the Earth clean should be taught to them. For example, recycling paper can prevent trees being cut from the forests. In order to have clean, fresh air, trees are big helpers. I believe improving the health of the Earth should be a big issue. And it is important for everyone to take action now, because this is the only way that the Earth can survive.
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