Can you identify a definitive cause for all the problems that humankind has brought to the planet and humankind itself?

I have my own idea. But I want to see what others say. Can you really nail it down and pin point the very reason why the Earth is undergoing a mass extinction and man-made climate change. Why oceans are polluted and the land deforested. Why the human population is under threat of pandemic and experiencing overpopulation. Why most destructive war Earth has ever seen happened less than a century ago. Why humans have a nack for killing, torturing, enslaving, oppressing and eradicating themselves and other beings? Really, what gives?

What we are describing is firstly a certain peculiar power that humankind possesses and secondly a seemingly irrational propensity to use it malevolently or destructively. I have two ideas that might explain both the malevolence and the unintentional destructiveness. What do you think?