Paul, despite the media nonsense the greenhouse effect is elementary physics.  Yes, more greenhouse gas will cause warming.  How warm will it get, don't look to the media because the answer is too complicated.  It depends on the feedback mechanisms active.  For example, higher temperature causes more water to evaporate which might make more clouds and clouds defeat the greenhouse effect by reflecting solar energy directly back into space.  Called negative feedback.  Multiple mechanisms are active and the media cannot present a meaningful discussion.  Bottom line is that CO2 remains in the atmosphere for centuries thus depletion rate is very slow.  Unless we get emissions below the depletion rate CO2 will continue to accumulate.  To get below the depletion rate would require draconian elimination of fossil fuel burning everywhere and elimination of deforestation.  China would like to burn Nat gas but warmers won't let it be exported so China burns dirty coal.  Warmers cause warming.