In other words, there is no debate at all. We (the human race) have known about the GHG mechanism for over 50 years. We've had the instruments to validate our understanding for well over 20 years now.
There is some disagreement between projections, the models definitely don't converge to the same point in 20-100 years, but they just don't agree on the breadth and depth of the catastrophe or the timeframe we have left to take action.
There is also disagreement wrt proposed solutions. Some things (like mass afforestation) are really too complex for us to predict the impact.