Retreat of glaciers since 1850 | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-17

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Retreat_of_glaciers_since_1850


00:02:16 1 Glacier mass balance
00:04:19 2 Middle latitude glaciers
00:05:18 2.1 Northern hemisphere – Eurasia
00:05:28 2.1.1 Europe
00:12:45 2.1.2 Siberia and the Russian Far East
00:15:21 2.1.3 Himalayas and Central Asia
00:21:36 2.2 Northern hemisphere — North America
00:22:31 2.2.1 Cascade Range
00:25:42 2.2.2 U.S. Rocky Mountains
00:28:14 2.2.3 Canadian Rockies and Coast and Columbia Mountains
00:30:06 2.2.4 Alaska
00:34:32 2.3 Southern hemisphere
00:34:41 2.3.1 Andes and Tierra del Fuego
00:37:33 2.3.2 Oceania
00:39:48 3 Tropical glaciers
00:41:27 3.1 Africa
00:44:35 3.2 South America
00:46:48 3.3 Oceania
00:49:53 4 Polar regions
00:50:38 4.1 Iceland
00:52:29 4.2 Canada
00:54:14 4.3 Northern Europe
00:55:40 4.4 Greenland
00:59:38 4.5 Antarctica
01:06:59 5 Effects of glacier retreat
01:11:40 6 See also



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SUMMARY
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The retreat of glaciers since 1850 affects the availability of fresh water for irrigation and domestic use, mountain recreation, animals and plants that depend on glacier-melt, and, in the longer term, the level of the oceans.  Studied by glaciologists, the temporal coincidence of glacier retreat with the measured increase of atmospheric greenhouse gases is often cited as an evidentiary underpinning of global warming.  Mid-latitude mountain ranges such as the Himalayas, Alps, Rocky Mountains, Cascade Range, and the southern Andes, as well as isolated tropical summits such as Mount Kilimanjaro in Africa, are showing some of the largest proportionate glacial losses.Glacier mass balance is the key determinant of the health of a glacier.  If the amount of frozen precipitation in the accumulation zone exceeds the quantity of glacial ice lost due to melting or in the ablation zone a glacier will advance; if the accumulation is less than the ablation, the glacier will retreat.  Glaciers in retreat will have negative mass balances, and if they do not find an equilibrium between accumulation and ablation, will eventually disappear.
The Little Ice Age was a period from about 1550 to 1850 when the world experienced relatively cooler temperatures compared to the present.  Subsequently, until about 1940, glaciers around the world retreated as the climate warmed substantially.  Glacial retreat slowed and even reversed temporarily, in many cases, between 1950 and 1980 as global temperatures cooled slightly.  Since 1980, a significant global warming has led to glacier retreat becoming increasingly rapid and ubiquitous, so much so that some glaciers have disappeared altogether, and the existences of many of the remaining glaciers are threatened.  In locations such as the Andes of South America and Himalayas in Asia, the demise of glaciers in these regions has the potential to affect water supplies in those areas.
The retreat of mountain glaciers, notably in western North America, Asia, the Alps and tropical and subtropical regions of South America, Africa and Indonesia, provide evidence for the rise in global temperatures since the late 19th century.  The acceleration of the rate of retreat since 1995 of key outlet glaciers of the Greenland and West Antarctic ice sheets may foreshadow a rise in sea level, which would affect coastal regions.