SAN FRANCISCO— Dropbox has caused industry outrage after it sent out a greenwashing promo email encouraging people to use its services and stating, misleadingly, that “Less paper = more trees”. Dropbox offers file sharing and cloud hosting services. It has more than 700m users worldwide, and nearly 17m paying customers including printers, graphic designers and magazines. Two Sides has written to Dropbox co-founder and CEO Drew Houston urging the company to stop using deceptive environmental claims about paper. “Dropbox’s misleading claims are damaging consumer and business decision-maker perceptions of paper’s environmental sustainability and threatening the livelihoods of millions of people in the global paper, printing and mail sector,” Two Sides stated. “Because we are advocating the use of print on paper, sending your letter by mail will have more impact, but we ask you to email a copy in the first instance and leave it to your discretion if you want to send the letter,” explained membership and anti-greenwash coordinator Gina Smith. Email for Drop Box is  press@dropbox.com . Since the Two Sides campaign began in 2010 it has successfully challenged more than 880 organizations globally about greenwashing messages.