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The background to their discovery was the development by physicists of a theory known as the “standard model”.A key feature of the model is that all the forces of nature involve the exchange of subatomic particles called gauge bosons.To do so, the researchers analyzed earthquake waves traveling through Earth, to image the structure of the Earth's interior."This method is comparable to CT scans used in hospitals to image inside bodies," van der Meer said.

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The findings are detailed in a recent paper published in the journal Proceedings of the National Academy of Sciences.Huge amounts of this greenhouse gas made the climate during the Jurassic Period extremely humid and warm, said geoscientist Douwe van der Meer, lead author of the study and a researcher at Utrecht University in the Netherlands. Climate: Test Yourself] Scientists have known for some time that a large amount of volcanic activity results in more CO2 than is present on Earth today, but with previous methods, it had been tricky to come up with a reliable estimate.Looking deep inside Van der Meer's team used a cutting-edge imaging technique called seismic tomography to reconstruct 250 million years of volcanic CO2 emissions.Since then, scientists' understanding of Earth has improved significantly, and researchers already had begun to suspect that the old estimates were imperfect."They were fundamentally flawed in hindsight," said van der Meer.