"You can go outside and spit and have the same effect as doubling carbon dioxide."

Sounds to me like he's saying it's absurd.

What you didn't point out is that the article appears in the Wisconsin Energy Cooperative News, funded be the electric generating industry.
Doesn't mean he's biased but it should be pointed out.

What I haven't seen is anyone complaining about scientists on the other side being funded by environmental groups. Or pointing out that those groups get their donations from people who get scared by the reports scientists write with funding from those same groups.
Doesn't mean it's biased but it should be pointed out.