Most climatologists agree that greenhouse gas levels are rising. There is also agreement that the earth is warming. But that's just about all that's agreed. The debate seems to center on two points. The first is that climate models still don't have it right.
More carbon dioxide is produced than actually ends up in the atmosphere.
And then, there has always been a question about how well the models treat atmospheric water vapor, which exerts much more influence on atmospheric heating than other greenhouse gases. MIT Professor Richard Lindzen, an expert on atmospheric dynamics, has often criticized climate models on some of these points. The second issue is whether or not observed warmings are natural or induced by human activity. Both sides in the debate agree that some warming is natural. Temperatures have been going up and down for hundreds, thousands, and millions of years.