Save the planet, one printer cartridge at a time at Longhorn Office Products/Worksmart! Printing is essential to our modern way of life. The thing is, toner cartridge recycling is a more responsible, sustainable way to deal with your empties, and it’s easier to do than ever before. The humble printer cartridge is going green. The need for sustainable printing is clear: estimates show that one million cartridges per day are thrown away. Print green with Longhorn Office Products!