We should use solar energy, We should adopt animals. We shouldn't buy animals. We mustn't hurt animals., We mustn't waste water., We must clean the environment. We musnt't throw garbage on the floor, We have to grow organic crops. We mustn't use pesticides, We mustn't use plastic bags. We should use reusable (fabric) bags, We should reduce, reuse, recycle, We mustn't pollute the air. We have to avoid the air pollution., We must protect the endangered animals. We mustn't kill endangered animals., We should ride a bike as much as possible, We should use public transportation to go to work as much as possible, We should plant more trees, We mustn't cut trees, Factories have to respect to rivers and not to dump chemicals, We should donate toys, We don't have to donate our new clothes but we should donate our old clothes, He has to turn off the light when he doesn't use it., Teachers must educate students about protecting theenvironment, We must shop wisely. We shouldn't buy unnecessary things., We should use long-lasting light bulbs, We have to stop global warming, W e must protect the forest. We mustn't barbecue in the forests. , We should use rechargeable batteries, We mustn't use chemicals. We have to stay away from chemicals,

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