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Both have happened much faster than predicted by climate models, and observed Arctic ...
As issues like climate change, global warming, and renewable energy dominate the national conversation, it's easy to assume these topics are exclusive to the modern world. When significant oxygen entered the atmosphere, ancient life multiplied.
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These variations, or offsets, of up to 20 years in the calibration of precise radiocarbon dating could be related to climatic conditions.
Scientists, studying evidence preserved in speleothems in a coastal cave, illustrate that more than three million years ago -- a time in which the Earth was two to three degrees Celsius warmer than ...
Arctic sea-ice has decreased rapidly during the last decades in concert with substantial global surface warming.
A technique for measuring the age of organic remains based on the rate of decay of carbon 14.
Because the ratio of carbon 12 to carbon 14 present in all living organisms is the same, and because the decay rate of carbon 14 is constant, the length of time that has passed since an organism has died can be calculated by comparing the ratio of carbon 12 to carbon 14 in its remains to the known ratio in living organisms.A new way of dating skeletons by using mutations in DNA associated with geography will avoid the difficulties and inaccuracies sometimes associated with existing dating methods. Gihon Spring was crucial to the survival of its inhabitants, and archaeologists had uncovered the remains of a massive stone tower built to guard this vital water supply. Using the largest set of radiocarbon dates ever obtained from a single Maya site, a team of archaeologists have developed a high-precision chronology that sheds new light on patterns leading up to ...