Schöne Idee vom WWF: Ein undruckbares Dateiformat (modifiziertes PDF) um den Wald zu retten. Toll!
The WWF format is a PDF that cannot be printed out. It’s a simple way to avoid unnecessary printing. So here’s your chance to save trees and help the environment. Decide for yourself which documents don't need printing out – then simply save them as WWF.
SAVE AS WWF, SAVE A TREE