Leachate is water that gets badly contaminated by contacting wastes. It seeps to the bottom of a landfill and is collected by a system of pipes. The bottom of the landfill is sloped; pipes laid along the bottom capture contaminated water and other fluid (leachate) as they accumulate.
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Carbon dioxide (CO 2) is a by-product of a chemical conversion process used in the production of clinker, a component of cement, in which limestone (CaCO 3) is converted to lime (CaO). CO 2 is also emitted during cement production by fossil fuel combustion and is accounted for elsewhere.