Nobody said we are a danger to the planet? We are a danger to everything that lives on it. We are having an effect on the climate in one way or another by all accounts, I mean we made a hole in the ozone? Pretty sure that counts as an effect we created. Human's are very much capable of damaging this planet so that life is non-existent as we know it. Imagine if we set off say 10 nuclear weapons? Massive change to the planet.
Yes it has been through much worse then us. But most of it has taken hundreds of millions of years to fix or adjust to and i don't know about you but i don't think the human race is going to be able to live in underground huts for that long while the planet rebuilds. Its not being conceited as much as trying to sustain our way of life. If you don't think we are capable of changing this planet look at this picture and then think, each of those lights have to be powered, built, maintained then think about what those are lighting up. Those have to have all those things as well. Shit we are taking millions of litres out of the water cycle by building massive concrete structures everywere. Your being ignorant and so are most humans. At the end of the day we are the dumbest form of life in 1 simple way. We are the only creature which had to destroy its surrounds to live, Every other creature adapts.