Could a Dinosaur survive in today’s climate?
It’s doubtful. T-Rex and Triceratops lived in the Cretaceous Period, which ended 66 million years ago. The average global temperature then was about 4°C higher than today.
Land dinosaurs would be quite comfortable with the climate of tropical and semi-tropical parts of the world today.
That is, until they all died of altitude sickness. Studies of air bubbles trapped in amber show that the atmosphere of the Cretaceous may have had up to 35% oxygen, compared to today’s 21%.
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