It absolutely is a violent act. In the same way that locking a person in a cage is a violent act, depriving people of the things they need to live is a violent act.
The fact is, simply asking these people to stop hoarding and polluting is not going to work (duh).
Is there a non-violent solution?
That's a bad comparison. The Wikipedia decision was made specifically because the experts -- i.e actual scholars of genocide and war crimes -- have a very widely held consensus that a genocide is occurring.
Do you disagree with the experts?