Yet the employees who carry out the operations that make up much of a supply chain's individual components, such as driving trucks, overseeing warehouses or operating fork-lifts, are not always treated as though their jobs are important.

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According to the Environmental Protection Agency, which regulates the stuff that comes out of the tailpipes of cars and trucks, it doesn't have the authority to regulate carbon dioxide, one of the main components of tailpipe exhaust.

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