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The fact that the earth has had many climates is in no way an argument that humans can't change our current climate in a way that we won't like.
To give a simple example, imagine a bathtub sitting out in the middle of a field. The bathtub fills with water when it rains, heats up when the sun shines on it, and freezes when it gets too cold. It does all this without human intervention.
Then, along comes a human who proceeds to pour boiling water into the bathtub. Is the temperature going to remain the same in the bathtub, or get hotter? Does the fact that the bathtub has been outside for years have anything at all to do with it?
The answer is clearly no, and if you were to make an argument that the bathtub would be just as hot anyway, without the boiling water, you would rightly be called an idiot.
