in my oppinion greatest threats are humans, their fear, their greed, their panic, and possible assosiations that find together to reach goals at the expense of others. like bitcoin for example.
I totally agreed with this submission. Human is the Earth greatest fear. Human greediness. Have you ever asked why this mass production of mass destructive weapons. Who are we hunting. Cyber war, economic war, global warming are all aftermath effect of man's action.