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The Data in a Dino's Smile
Dinosaur teeth are unique windows into Earth’s ancient air
Oxygen isotope levels in dino teeth from Europe, North America, and Africa also suggest that the sum of Earth’s plant life was twice as photosynthetically active as the planet’s greenery is now. Further details of the climatic reconstruction suggest that the Late Jurassic (about 150 million years ago) was marked by a concentration of atmospheric carbon dioxide that was four times higher than the levels present on Earth prior to the 19th century’s Industrial Revolution, when humans starting pumping the greenhouse gasses into the air. Lead photo: Teeth from dinosaur fossils, such as this Tyrannosaurus rex discovered at Murray Ranch in Montana, retain signatures of the atmosphere that existed when the creatures roamed the Earth.
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