Location
 North America
 75 million years ago

Mean atmospheric O₂
 150% of modern level

Mean atmospheric CO₂
 6x pre-industrial level

Mean temperature
 4°C above modern level

A pair of 3 ton plant-eating ornithopod dinosaurs of the genus Parasaurolophus dine on flora near a waterfall 75 million years ago in North America. Similar to plant-eating Lambeosaurus of the same period, these dinosaurs also sported a distinctive hollow cranial crest.