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 agree, and that human greed destroys our planet. Ruining the natural form of of earth. We are not contented on what the nature gives us, we always want more, and more and more. That we didn't think how will it affect the entire human beings.