contradicting notice

Today, I just saw a notice in my pantry that says "Protect the earth, use less paper cup" then to my surprise, we do not have paper cups. We have styrofoam cups... Erm... Is the styrofoam cups more hurting to the earth or the paper cups? To what I know styrofoam cups are non biodegradable but paper cup could be biodegradable.. Perhaps the company thinks that paper cups are hurting the earth so they use styrofoam cups that "would not" hurt the earth?? Hmm.. who knows..