Josh Fink writes "A group of Dutch Scientists have recently released a study stating that they have found that changes in Earth's orbit around the sun are linked to mammal extinctions. From the article: '"Extinctions in rodent species occur in pulses which are spaced by intervals controlled by astronomical variations and their effects on climate change..." The cycles are associated with lower temperatures, changes in precipitation, habitats, vegetation and food availability which are the main factors influencing the extinction peaks, the study published in the journal Nature said.' So on top of worrying about global warming, it seems we should also worry about the physics that govern the orbit of Earth around the sun. Too bad we don't have a way of keeping the Earth in the same orbit/on the same axis of rotation."
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