It's true that life has existed for a long time and survived a number of mass die-offs, but humans have only been around for a tiny sliver of that time. So yea

It's true that life has existed for a long time and survived a number of mass die-offs, but humans have only been around for a tiny sliver of that time. So yeah, it's unlikely that humans could kill off all life on earth even if we keep trying to do so, but it's certainly possible that they'll cause their own destruction. I think it's unlikely that human activity will lead to mass die-offs (of humans, we're already in a mass extinction event of animals) but our children and grandchildren may be in for a big lifestyle change.