Anno 2070 apparently has online and offline modes, and I'm wondering how those modes are different. I found some discussion of what you can't do in offline mode, but having not yet played the game those specifics weren't very helpful for me.
Basically I'm wondering about whether the online mode adds legitimate multiplayer-like content/gameplay, and whether offline mode is artificially restricted as a form of DRM. (Ie. am I punished for playing offline, or am I just playing by myself?)