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A paleontologist explains why bringing back dinosaurs is a really bad idea
First, bringing back T. rex and Triceratops would, I believe, simply be cruel. They lived during the end-Cretaceous period, some 70-66 million years ago, when the world was a much different place. It was considerably warmer, there were no ice caps, sea levels were high and the oceans lapped far onto the land, and the continents were in other positions. Dinosaurs would have breathed different air (there was much more carbon dioxide in the atmosphere then), eaten different food (grasses and flowers had just started to evolve, and there were none of the grasslands or vast flowering forests of today), and interacted with different animals (mammals were little more than ratty creatures scurrying in the shadows).