You're making an important environmental impact by returning your cartridges for reuse. Shipping your cartridges with a prepaid shipping label will make your impact even more significant. Downloading a label instead of ordering a new recycling box will prevent the generation of 2 tons of greenhouse gases.* It would take more than 50 young trees 10 years to capture all the carbon dioxide generated by the manufacture and shipment of that one recycling box.**

*The manufacture of one, 2.8 pound unbleached corrugated cardboard box comprised of 52% recycled content will generate 6 pounds of carbon dioxide equivalent (Paper Calculator 3.1, Environmental Paper Network, calculator.environmentalpaper.org). Shipment of that box to the customer on a UPS truck weighing 19,500 pounds ("Workhorse Delivers UPS Its First New Fuel Efficient W62 Gas Chassis," WebWire, http://www.webwire.com/ViewPressRel.asp?aId=114034) from the box manufacturer to the customer will average 1,100 miles and will generate 2.2 tons of carbon dioxide (Shipper Logistics Model, US EPA SmartWay Transport, http://www.epa.gov/smartwaylogistics/transport/become-partner/join.htm). **2.203 tons of carbon dioxide or carbon dioxide equivalent is equivalent to the carbon sequestered by 51.2 tree seedlings grown for 10 years (US EPA Greenhouse Gas Equivalencies Calculator, http://www.epa.gov/cleanenergy/energy-resources/calculator.html).