Summary: The primary cause of climate change is the emission by humans of greenhouse gasses (GHG) of a certain type.
The type of GHG is that emitted is by combusting (burning) hydrocarbon fuel without either:
The same amount of GHG being absorbed during the manufacture of this fuel, plus a surplus amount being absorbed to compensate for the energy required to manufacture and transport the fuel if generating this energy also produces GHG.
And/or an independent process captures and sequesters GHG from a different, non-emitting source (like direct-air GHG-capture). Like the above other bullet, a surplus amount of GHG should be absorbed and sequestered to compensate for the energy required to capture and sequester the GHG, if generating this energy also produces GHG.