The geography of the Cretaceous is scarcely recognizable to today's observer. The majestic Himalayas had yet to form. The rugged Rockies consisted of hills and active volcanoes. Even the outline of the continents was unfamiliar. Because the slow but inexorable process of continental drift has had considerable effect in the intervening eons, land masses then were in different, generally more equatorial positions. South America and Africa were joined. The oceans were higher, so large parts of North America, Africa, and Europe were submerged.

Geologists have proposed that the altered position and topography of the continents account for the sweltering Cretaceous climate. With lower elevations and less land in northern regions to accumulate snow and ice, the entire globe should have been warmer, the argument goes. But a lingering question has been whether these geographic differences fully explain such a radical climatic departure. During this era, the general measure of climate appears to have been over 10 degrees F. hotter than now. This means, for example, that the weather in Greenland was Floridian, as attested by alligator-like fossils unearthed there. Evidence also suggests that the deep oceans were then about 20 degrees F. warmer than today. At the poles, no evidence of permanent icecaps has been found.

Experts have been examining the fossilised remains of a 26ft high gorgosaurus which roamed North America before its death.

The researchers have found that dinosaur suffered several injuries in the months before its eventual death which would have been fatal for humans or mammals.

Experts believe that studying dinosaur descendents such as alligators and crocodiles could provide cures for human illnesses ranging from bacterial infections to cancer.

Of course, dairy's not an option with reptiles and using feathers from dinosaurs in lieu of wool from sheep will make the textile industry an interesting one. I'll buy that a nomadic lifestyle would be possible (ie, following the herds), but could a society like ours work with dinosaurs as livestock? I'm looking at all the various species of dinosaur which have actually existed, so no new species have evolved (but they can breathe the same air we do, eat the vegetation that grows here and are able to exist on the same world that we live on now).

And for the sake of the answer, nasty carnivores can be seen as a non-issue (they're either chased off, exterminated or somehow domesticated).