We can change the earth, but eventually the earth just sorts iteself out by counteracting the changes we have caused.
And it does that by making it uninhabitable and wiping us out.
Global warming undoubtedly exists, because it does anyway in the earth's natural cycle. And if we speed it up, then the cycle will simply happen faster. That means that we, who are still in an ice age, will come to the end of that ice age quicker, with the added problen of having a big crack in the ozone layer so it happens even quicker and we get even hotter.
The earth will outlive any species on it.