Spread the knowledge of esperanto, the international language
Esperanto was created 1887 by the polish jew Ludwik Łazarz Zamenhof as a tool for international communication. Its grammar and vocabulary is mostly imported from the major European languages and is higly regular.
The cause of this cause is not to spread Esperanto it self, but the knowledge of it. Too many people belive that it is dead and not widely used, and to them I highly recommend the wikipedia articles concerning the subject:
1. The knowledge of Esperanto should be spread.
2. Esperanto culture is vivid.