This article from the widely respected The Economist, reveals that climate scientists
The mismatch between rising greenhouse-gas emissions and not-rising temperatures is among the biggest puzzles in climate science just now. It does not mean global warming is a delusion. Flat though they are, temperatures in the first decade of the 21st century remain almost 1°C above their level in the first decade of the 20th. But the puzzle does need explaining.
Hmm. It's mid-May and it's the first I have heard about this. And this article was March 30. Wonder why?