Greatest threat to the life on Earth is homo sapiens.
We ruin our one and only home with plastics, trash, climate change etc.
Today humanity consumes nature in the name of modernisation, however true modernisation can never arise from exploitation. We shall be in harmony with nature. Otherwise nature will get rid of us.
I certainly agree with that. In some way, we can say that a man is the Earths greatest threats because the man is ignorant and reckless...