On my “Climate Changes, But Facts Don’t: Debunking Monckton” videos this claim was popping up a lot. The reasoning is that because global surface temperatures haven’t risen for over 15 years this means that global warming has stopped and that the projections are wrong.
Unfortunately this ignores a lot of evidence that the planet is still accumulating heat. As I had to explain this constantly in my comment sections on YouTube it prompted me to push the script I was writing about this to the top of the queue:
As usual you can find a full transcript, source listing, and used media resources in the video transcript section.
If you want a more detailed explanation of the science involved the following AGU presentation by Richard Alley is an excellent watch. With over 40 minutes of time he goes into great detail of why this is an oversimplification of what is happening to our planet (we both basically say the same thing, only difference being the level of detail due to time constraints).