Two reports issued this month by the Massachusetts Institute of Technology's Concrete Sustainability Hub examine the life cycle costs of concrete buildings and pavements, in terms of both dollars and greenhouse-gas emissions. The group's findings suggest that the use of different methods and materials in creating pavements could make a huge difference in the impact on the environment. Among other possible tactics that the report suggests: increased use of fly ash, using lighter-colored pavements and allowing old concrete time to absorb carbon dioxide from the air.

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