ping
It does pay to speak about the levels of atmospheric CO2. They are increasing. To be sure, over long periods, climate can cause CO2 changes, but the increases observed over the past century are likely due to man's activities. When and if the levels double, they will increase the radiative forcing of the planet by about 4 Wm-2, or about 2 percent. This will prove relevant.
I take it as fact.
He goes on to contend that the current consensus is dishonest as well as wrong, and motivated more by personal financial concerns than legitimate science - a cheap shot...and disgustingly self-righteous.
He then says Kyoto would most likely be ineffective even if fully implemented. Almost certainly correct. And that any currently proposed mitigation efforts would also be ineffective. Again correct.
He then claims that there's no reason for alarm, that the CO2 build-up is not-threatening. Bullshit.
Thanks for the ping, but Lindzen hasn't changed his tune much over a decade.