They used to call it global warming, you might remember this:
Al Gore, qualified bs'er, was behind that farce, since then they have had to change the term to 'climate change' as global warming was factually incorrect wheras climate change is vague enough that it can mean anything.
Of course the climate changes, the earth goes through cycles over long periods of time where it may get 1 or 2 degrees warmer for a couple decades and then it it will drop again over time, so you could call it variance.
The whole 'humans causing co2 emissions' is a load of tosh, just another control mechanism that the elites like to force upon us.