33 Those products are friendly to the environment
34 We are responsible for preventing environmental pollution
35 I think we should put a lot of trash cans around the schoolyard
36 We should exercise a lot so that we will have a healthy lifestyle
37 Polluting air can cause illnesses and even death
38 Mr Thomas is one of the most famous environmentalists in the world
39 using less energy helps us save money and conserve the environment
40Solar energy can be easily used in tropical countries
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