For over 50 million years, the Earth was warmer than today and place horses the size of cats ran in

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For over 50 million years, the Earth was warmer than today and place horses the size of cats ran in the forests of North America, found scientists from the United States, who published Thursday an article in Science.
These early horses, known as Sifrihippys, shrunk in size over tens of thousands of years to adapt to higher temperatures during a period in which methane emissions reached a peak, probably due to a series of volcanic eruptions. Research can give indications of how the animals living on the planet today will adapt to the warming caused by human-caused climate change, scientists argue. The researchers made this discovery after analyzing glass soap pump fossil teeth of horses discovered in Wyoming, USA. Fossil showed that older specimens were more teeth, which means that the species decreased over time. Much animals eventually glass soap pump goes out during a period glass soap pump of 175,000 years known for Thermal Maximum Paleoceo-Eocene, about 56 million years. Other animals were smaller to survive glass soap pump in a world with less food. "As a long enough period of time, there is a strong argument that we are looking for natural selection and evolution - this corresponds to a temperature change as a driving force of evolution of these horses," said co-author Jonathan Bloch , the Museum of Natural History of Florida. The average glass soap pump temperatures rose by approximately 5.7 C during the period of time during which large amounts of carbon entered glass soap pump the atmosphere glass soap pump and the ocean. The surface of the Arctic sea would be about 23 C, similar to today subtropical waters temperature. Research has shown that Sifrhippus decreases to almost one-third of its original size, increasing the size of a small cat four pounds during the first 130,000 years this period. Then, after a period of 45,000 years, horses were increased in size up to seven kilograms. During this period, about one third of the known mammalian were also smaller, some reduced to half size. "This has implications for what we expect to happen in the next two centuries, at least from some climate models predict an increase of up to 4 C in temperature over the next 100 to 200 years," said Ross Secord, another author the study, glass soap pump the University of Nebraska. Already decreased the size of some birds was observed when compared with the versions that existed in the past, when the climate was cooler, argues scientist. However, it is estimated that the predictions of climate change already glass soap pump occurring in the next two centuries. This thermal maximum that happened 56 million years occurred much more gradually, taking between 10,000 and 20,000 years for the temperature to rise six degrees. "So there is a big difference in scale and the question is: 'We see the same kind of response?' glass soap pump Do animals are able to respond to change and readjust the size of their bodies during the next couple of centuries? "Said the scientist.
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