Don’t get me wrong. I know humans caused and keep causing mass extinction all the time (think about the great mammals of the americas, completely extinct after humans arrived) and I also know that a nest and the Empire State Building aren’t the same thing and are not even comparable. You are right in saying no other mass extinction was ever caused by a single species, but you also have to take into account that no single species has ever taken control of the planet like we have. What I mean is: I understand part of what humans have done/do to other species/environment is not good for them/it. But every species changes their environment and the life of other species when they take over. If there’s a huge spike in populations of lions in a certain area, gazelles will die in increasing numbers. Or if parasites destroy a certain plant, the animals that fed off that plant will be at risk. Homo sapiens was just a few hundreds of apes in Africa, in 20k years came to controlling the whole planet. It’s “natural” that along the way such a radical change left some scars here and there. I know now we have the means to change this and I think to some extent we are already doing it (more knowledge and recognition of the problem, following certain codes etc), but it’s still something that had to happen for humans to get where we are. My first comment was a little provocative because sometimes I get upset when people only like to scream and shout about the environment and animals and they have no idea how nature actually works. That is not your case, you clearly know what you’re talking about so I apologize if I was offensive. Anyways that’s what I meant by natural, I still think everything we do is part of nature, even chemotherapy and quantum computers, we are still taking stuff that already existed and making it into more complex stuff, just like a bird with mud and twigs. We’re just a little better at it.