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[Sian Proctor:] When you are constructing, you need a lot of concrete.  What a lot of people dont realize about concrete is that it actually generates a lot of heat.

[Harry Pritchett, narrator:] When water is added to cement, it causes a chemical reaction that produces heat. ~ from Stargate in the Jungle, Strange Evidence, Science Channel, first aired 6/20/2019.

Write the paragraph to said that why do you agree with these people above and how they are affecting to the environment.

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