Could we live in a dinosaur world?

If you got sucked back to dino times, you might get snacked on by a giant meat-eater. But what other dangers would you face?

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• 0:17Speaker 01

  Hey, it's Flora Lixman, and you're listening to Science Friday. In the new movie, The End of Oak Street, bits of a suburban Michigan neighborhood get sucked back through time to a prehistoric world of dinosaurs. Exactly which geologic age is somewhat murky, but think Land of the Lost, just with Anne Hathaway.

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  I think that our neighborhood

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  has moved.

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  We're in the past, aren't we?

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  How the hell is that even possible?

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  Which made us wonder, aside from the danger of getting snacked on by an allosaurus, what else would modern humans face in that ancient world? And we knew exactly who to call, paleontologist Steve Prisati. Hey, Steve.

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  Hey, good to speak with you guys again about dinosaurs and movies.

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  Yes, thank you for this emergency taping. Had to get these questions answered. OK, so if I got sucked back into the age of dinosaurs, and let's pick a time, let's say the Cretaceous.

• 1:22Speaker 04

  OK, like the day before the asteroid hit. Let's say that, maybe, yeah?

• 1:26Speaker 01

  Sure.

• 1:28Speaker 04

  66 million years ago, OK.

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  What would I notice first?

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  I think, first of all, you would notice that there would be T. rexes chasing you down. I think that would be pretty apparent. There would be a lot of dinosaurs. Not all of them would be huge, but many would be. And there would also be birds, but weird birds, that had teeth and claws. And there'd be pterodactyls flying through the skies. You would notice that right away. I think you would also, you would notice that there were not very many mammals. If you saw a mammal, it would just be a tiny little one scurrying around. And you would not see any grasslands or prairies or savannas or any sort of environments like that. There were some little grasses that were just starting to evolve, but they had yet to reshape the landscape.

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  Those would be the most obvious things you would see, but you would probably feel things, too, because the atmosphere would be a bit different as well.

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  Would I be breathing the same? Would the temperature be similar?

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  The temperature generally would have been quite a bit warmer back at the end of the Cretaceous. And this was because there was more carbon dioxide in the atmosphere. And there are actually ways, it's really ingenious. There was a study that was published last year where some chemists and some paleontologists worked together to study dinosaur teeth. The enamel, the oxygen in the tooth enamel of these fossil dinosaurs actually is something of a paleothermometer. And it also can give insight into the amount of carbon dioxide when it was formed, just by differences in the chemistry of the oxygen. And they actually found that during part of the age of dinosaurs, the amount of carbon dioxide would have been something like three times as much as there is in the atmosphere today.

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  And even at the very end of the Cretaceous, when the asteroid hit, carbon dioxide had been falling a little bit, but it was probably something like, maybe even double the amount that we have in the atmosphere now. We could have breathed that air, but the air would have been harder for us to breathe.

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  You might be huffing and puffing a little bit more.

• 3:32Speaker 04

  I would be. I know what it's like to cycle, to ride my bike up and down these hills here in Edinburgh, and I would not want to do that in an atmosphere with double or triple the amount of CO2.

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  OK, what about disease? I mean, would modern diseases threaten the dinosaurs? Or would I be threatened by some kind of dino flu?

• 3:52Speaker 04

  I think it would work both ways, and it would be a real concern. You know, from the fossil record, we can't really tell much about viruses. You don't get fossilized viruses. But you do see on dinosaur bones signs of infection. And there are some lesions on dinosaur bones, for instance, that really match injuries on bones in modern day birds and other animals that have a certain type of virus or a certain type of bacterial infection. So we do actually have, believe it or not, fossil evidence of viruses and bacterial infections. So it is something we'd have to concern ourselves with.

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  OK, in the 10 seconds I have left, if you could be swept through a wormhole to the past, where and when would you go?

• 4:33Speaker 04

  I actually would love to see that last day of the Cretaceous, 66 million years ago, that morning, where you would wake up, and there would be T. rexes and triceratopses and duck-billed dinosaurs and pterodactyls in the air. And they would have no idea, no idea what was about to hit them, no idea how much the world would dramatically change. Wouldn't that be something, to see those last T. rexes?

• 4:58Speaker 01

  The eve of disaster. I feel like I learned something new about you today, Steve. Steve Prisati is a paleontologist and author of The Story of Birds: A New History from Their Dinosaur Origins to the Present. And he's based in Edinburgh, Scotland. This episode was produced by Charles Bergquist. And if you need a quick science fact check on a summer blockbuster or any other science-adjacent question, pick up that Flintstones Rock Bell phone and call us. 877-4-CY-FRY is our number. Have a great weekend. I'm Flora Lixman.