Is it runaway warming? Who knows?
Is it harmful warming? You are obviously not a gardener!
Is it so minute that it is a waste of recourses to try and prevent. So far the evidence is heavily weighed against this notion.
Is it a main driver of climate? No it is not a main driver of climate. It is, however an unprecedented driver of rapid climate change at a rate that will preclude adaption for much of the biosphere.
Is there a feed back loop that magnifies the warming? Who knows. That's why "The Precautionary Principle" should be invoked: The Precautionary Principle | Precautionary Principle
A big issue with "global warming" is the accumulation of energy in weather systems. Don't think for one minute think that weather with more energy is going to be kind to humans.