We are the products of our environment — and that goes for egrets and elephants as much as human beings. The history of all life on this planet has been one of change and adaptation. The environment changes, and life adapts. That’s evolution in a nutshell.
So it shouldn’t be a surprise that as the planet’s climate has changed through the geologic past — and it’s changed severely, from the hot and humid earth of the Triassic period to the ice ages that ended just 20,000 years ago — life has changed along with it. In a new paper published in the Proceedings of the National Academy of Sciences (PNAS), a group of researchers plot out just how the changing climate has impacted mammalian evolution in North America over the past 65 million years.
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