April 3rd marks the 150th anniversary of the famed Pony Express. Just as that first overland mail delivery was replaced by the telegraph, today's postal service is struggling to stay in business as e-communications become the norm. The USPS is exploring the possibility of eliminating Saturday delivery to save money. Sam Pulcrano, vice president of sustainability for the postal service, explains to host Jeff Young how one day less would affect the USPS's carbon footprint.