Walmart, DuPont, and General Electric, among other companies, have joined international consortiums that aim to develop a single metric for measuring carbon dioxide emissions associated with a product. They hope that if there's a single up-front method, it will be easier to distinguish companies that make substantial environmental strides from those with merely a green spin. "If we have a competitor out there making claims, and we're making claims, we really want to make sure that there's a standard," says Robert ter Kuile, senior manager of energy and climate change with PepsiCo International.

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