They didn't really endorse the IPCC; That has a hint of Onion in it.
So did this issue of The Economist from Feb. 13, 2003
Projecting greenhouse-gas emissions which had a letter to the editor pointing out that the IPCC economic models using Official Exchange Rates "...leading to such conclusions as the average citizen in North Korea will be richer than the average citizen in United States in 2100"
North Korea signed the Kyoto Protocol April 27, 2005.
Here's the story North Korea to import solar power to give soldiers TVs