I suppose you are referring to anthropogenic climate change due to greenhouse gases, and manmade carbon dioxide in particular. It is plausible, but not proven.
If you ever saw the change in absorbance at the wavelength at which carbon dioxide absorbs in an infrared spectrophotometer, you would agree it is plausible.
My own inclination is that for whatever reason the sun has increased its output of radiant energy, and that's why it's getting warmer.