What happened to the asteroid strike or volcanic activity theories?
a. Climate fluctuation had nothing to do with the dinosaurs demise and they are not making that argument.
b. The Chixculub 'asteroid strike' is not a theory, but an established fact. The crater is in Yucatan and has been conclusively dated to 65MYA, when the dinosaurs disappeared. That it caused the extinction of just about every critter we know of bigger than about 50 pounds is established by extensive and varied evidence from the geologic record and the fossil record.
To get back on topic, every time I point out to the 'global warming' nuts that the earth was so warm during the Mesozoic that BOTH Antarctica and Alaska (which were in about the same positions as they are today on the globe) supported temperate rainforests, they usually end the discussion (or, in the case of one 'green' blogger, repeatedly erase my posts on their website.....