It's important to develop ____ of energy like wind or water. I try not to fly because planes produce a lot of ____ that go into the atmosphere. ____ is a big problem in which temperatures continue to rise and our weather is changing. We need to stop using ____ Our ____ is much higher in the winter because we have to heat the house. If we don't ____ in the sea, hundreds of species of fish will disappear. I try to buy ____ products that are made without polluting the environment. Don't ____ all that paper, it should be recycled.

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