Yes, but have humans caused more damage to the planet than other life forms?
Scientists thought the first time oxygen suffused the atmosphere for any major length of time was about 2.3 billion years ago in what is called the Great Oxidation Event. This jump in oxygen levels was almost certainly due to cyanobacteria — microbes that, like plants, photosynthesize and exhale oxygen.Sep 25, 2013
You can go back in time and prevent a great catastrophe.
Which one would you prevent?
I 'd prevent slavery, leaving the blacks undisturbed in Africa.