The Little Ice Age (LIA) was a period of regional cooling, particularly pronounced in the North Atlantic region, that occurred after the Medieval Warm Period. It was not a true ice age of global extent. The term was introduced into scientific literature by François E. Matthes in 1939. The time period has been conventionally defined as extending from the 16th to the 19th centuries, but …

The global temperature record shows the fluctuations of the temperature of the atmosphere and the oceans through various spans of time. There are numerous estimates of temperatures since the end of the Pleistocene glaciation, particularly during the current Holocene epoch. Some temperature information is available through geologic evidence, going back millions of years.

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Ancient air bubbles trapped in ice enable us to step back in time and see what Earth's atmosphere, and climate, were like in the distant past. ... in the atmosphere are higher than they have been at any time in the past 400,000 years. During ice ages, CO 2 levels were around 200 parts per million (ppm), and during the warmer interglacial ...

Sep 01, 2010 · Records show that ice ages typically develop slowly, whereas they end more abruptly. Glacials and interglacials within an ice age display this same trend. On a shorter time scale, global temperatures fluctuate often and rapidly. Various records reveal numerous large, widespread, abrupt climate changes over the past 100,000 years.

An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers.Earth's climate alternates between ice ages and greenhouse periods, during which there are no glaciers on the planet.Earth is currently in the Quaternary glaciation.

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In the 21st century, major changes to the ice pack due to climate change have stirred speculation that the passage may become clear enough of ice to permit safe commercial shipping for at least part of the year. On August 21, 2007, the Northwest Passage became open to ships without the need of an icebreaker.According to Nalan Koc of the Norwegian Polar Institute, this was the …

The paleoclimate record combined with global models shows past ice ages as well as periods even warmer than today. But the paleoclimate record also reveals that the current climatic warming is occurring much more rapidly than past warming events. Temperature histories from paleoclimate data (green line) compared to the history based on modern ...