The Economist writes:
BETWEEN 1998 and 2013, the Earth’s surface temperature rose at a rate of 0.04°C a decade, far slower than the 0.18°C increase in the 1990s. Meanwhile, emissions of carbon dioxide (which would be expected to push temperatures up) rose uninterruptedly.
Then proceeds to offer a bunch of after the fact explanations but I wonder what environmental model predicted this, a priori? Probably not many.
Economist Bryan Caplan has more here.