You can read the rest of his opinion piece right here.
The fact is that climate science is fiendishly hard because of the enormous number of variables that interact in ways no one fully understands. Scientists should welcome contrarian views from respected colleagues, not try to squelch them. They should admit what they don't know.
It would be great if this were all a big misunderstanding. But we know carbon dioxide is a greenhouse gas, and we know the planet is hotter than it was a century ago. The skeptics might have convinced one another, but so far they haven't gotten through to the vanishing polar ice.