The United States Postal Service furthered its efforts to embrace new, green technologies this week, even as these technologies eat away at the USPS' age-old business model of letter delivery. Over the past couple years, the postal service has been employing cleaner energy at some of their plants and experimenting with hybrid diesel-electric alternatives for some of their 200,000 + vehicles. This week, USPS launched a program that allows patrons to pick up postpaid envelopes......