Nic Kristof, last July:

"Kyoto would have wrecked our economy,” Mr. Bush told a Danish interviewer recently, referring to the accord to curb carbon emissions. Maybe that was a plausible argument a few years ago, but now the city of Portland is proving it flat wrong.

Newly released data show that Portland, America’s environmental laboratory, has achieved stunning reductions in carbon emissions. It has reduced emissions below the levels of 1990, the benchmark for the Kyoto accord, while booming economically.

Nic Kristof, this July:

But all across the country, states and local governments have chipped away at those arguments for delay — actually, pretty much demolished them — by showing that there are myriad small steps we can take that significantly curb carbon emissions and that are easily affordable.

A leader of that effort has been Portland, earnestly green even when it is wintry gray. In 1993, the city adopted a plan to curb greenhouse gases, and it is bearing remarkable fruit: local greenhouse gas emissions are back down to 1990 levels, while nationally they are up 16 percent. And instead of damaging its economy, Portland has boomed.

Kristof really likes Portland. Or else he’s having trouble finding other good news.