[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.