It corresponds with the end of an interval known as the Medieval Warm Period.
Few will dispute that the naturally occurring Medieval Warm Period was good for the human condition and the biosphere.
Famine and plague, which had largely disappeared during the Medieval Warm Period, became the norm rather than the exception.
This ikaite record qualitatively supports that both the Medieval Warm Period and Little Ice Age extended to the Antarctic Peninsula.
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In fact the present warm period may well be at the top of a natural millennial cycle as previously occurred during Roman and Medieval times.
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Temperatures are probably about the same today as during a "Roman Warm Period" slightly more than 2, 000 years ago, and much warmer than the "Dark Ages" that followed.
So here we have evidence of a change of climate, which appears to have occurred at the same time as some parts of the world were entering the Medieval Warm Period (MWP).
The Little Ice Age, following the historically warm temperatures of the Medieval Warm Period, which lasted from about AD 950 to 1250, has been attributed to natural cycles in solar activity, particularly sunspots.
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Home Depot shares might not have held up under pressure when the company reported fourth quarter results because of a highly profitable winter last year an unseasonably warm period that boosted numbers across retail.
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The Medieval Warm Period and the Little Ice Age were an embarrassment for those who, in recent years, wished to play down the natural variations in climate that occurred before the Industrial Revolution.
Certainly the warm period increased the productivity of crops which led to an increase in population, the subsequent cooling (and more importantly, change in rainfall patterns) reduced agricultural productivity and led to hunger and starvation.
One was that the Medieval Warm Period which occurred between about AD 800 and 1100 along with the Little Ice Age (not a true Ice Age) which occurred between about AD 1350-1850 somehow turned up missing.
Skeptics believe that temperatures will rise due to CO2, but will remain within the bounds of temperatures we have already seen over the last millenia, including those in the Medieval Warm Period during which European civilization thrived.
Attempts to argue that such events were not global are contradicted by abundant evidence for the Medieval Warm Period and the Little Ice Age from East Asia, Australasia, South America and South Africa, as well as from North America and Europe.
Doubters for the most part are big fans of the medieval warm period, and see in the climate scientists' arguments an attempt to rewrite history so as to maximise the drama of today's warming and minimise the possibility that natural variation might explain the 20th-century record.
The records from a particularly warm period called Marine Isotopic Stage 11, which occurred around 400, 000 years ago, suggest that warming of 1.5C compared to the present is enough to cause substantial thawing of permafrost - even in areas far north from its present-day southern limit.
They are cooler than the "Medieval Warm Period" about 1, 000 years ago when Eric the Red and his Icelandic Viking tribe settled on grasslands of Greenland's southwestern coast, and much warmer than about 400 years ago when the Northern Hemisphere plunged into depths of a "Little Ice Age" (not a true Ice Age).
Continuing to chew after the warm-up period seems to have required too much jaw-work, and burning more energy negated the benefits.
Summer temperatures between 21 to 50 AD were about 1 degree Celsius warmer than now, and they were just as warm during the Medieval period about 1, 000 years later.
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Evidence from the spacecraft NASA has sent to Mars so far suggests that the "warm and wet" period on Mars lasted for the first billion years of the planet's history.
The department said the strength of the report was partly due to unseasonably warm weather in the survey period.
Shreve, who's the author of 13 novels, has written an engrossing, somewhat offbeat memoir called Warm Springs, about the period, between ages 11 and 13, that she spent at the famous sanitarium, where she seems to have been the reigning mistress of misrule.
During the Jurassic period, 165 million years ago, the area was a warm shallow sea.
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The unusually warm weather in October and November has severely curtailed the traditionally profitable winter clothing sales period.
There is clear evidence that winter storms throughout southern Scandinavia were more frequent and intense during the multi-century Dark Ages Cold Period and the much more recent Little Ice Age than either now or other comparably warm periods.
The 20 to 30 year ocean temperature cycles turned back to warm from the late 1970s until the late 1990s, which is the primary reason that global temperatures warmed during this period.
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