Comment by Jyaif
If we wanted to, we could set back biodiversity 50 million years, in the sense that it would take 50 million years to get back animals as diverse as there are today. Knowing that earth has 200 million good years left, yes we are pretty damn big threat.
A large enough object coming close enough to our planet could also do that.
Humans have and will continue to destroy lots of living and non-living material. Unless some huge global awareness or higher sentience will reduce that immensly very quickly, humanity as we know it, will end on this planet. With the rising CO2 levels i doubt our intelligence will get any better.
And the planet will quietly do its dance around its star..