#3: Planet Noob
The internet is having a field day with this one. Noob is already a fun word to use for people who are new to something, and we obviously haven’t hacked how to run the Earth yet. It seems to me like there is a Planet Noob, and we are standing on it. That would make a more fitting name for planet Earth.
As for Planet B, if this is supposed to be a twist on the morning after pill, Plan B, missed the mark. Maybe they were recycling protest slogans and slapped a giant circle to cover up something from the last march they went on. I bet they’d make a new sign after seeing how this one was interpreted.