Wal-Mart today is set to unveil an environmental labeling initiative that would require all of the retailer's 100,000-plus suppliers to submit sustainability data for all their products. The information will be used to create a label akin to nutrition information on food packaging and may include data on solid waste, greenhouse gases and community development. The cost to suppliers could be high, but Wal-Mart insists there will be no exemptions.

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