Answer: A) United States Postal Service
Next time you receive an express mail or priority mail package, look for the Cradle to Cradle logo on the container. As reported here on Treehugger, "all Express Mail and Priority Mail packages and envelopes supplied by the (Postal) service now meet Cradle to Cradle Silver certification.
More than 60 packaging items were examined, breaking those items down to 250 component materials and then further analyzing 1,400 individual ingredients. These were then assessed according to various criteria ranging for human and environmental health, including toxicity, renewable energy, water stewardship, recyclability and other manufacturing attributes. "
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