[Renfield]

"...Besides, we find dinosaur bones in Alaska and Atarctica...."

Additionally, remember that climate and weather patterns are not constant. During the Mesozoic, the earth's climate was generally quite a bit warmer than it is now. Go to this link:
http://www.scotese.com/climate.htm
and explore maps of the climate of the Triassic, Jurassic, and Cretaceous for a good overview.

[muawiyah]

Alas, not all dinosaurs were fully warm-blooded, so, the question has been, how did they maintain a constant, or nearly constant (and thereby more useful) body temperature?

Feathers (each affixed to little muscles in the hide) which can be opened and closed (fluffed like modern birds do) answers that question.

Now, the big question ~ did they taste like chicken?

[Mr Rogers]

During the Mesozoic, the earth's climate was generally quite a bit warmer than it is now.

Undoubtedly due to human interference with the atmosphere prior to the Mesozoic...