Retreat of glaciers since 1850Recent shrinking of glaciers due to global warmingAlaska's McCarty Glacier retreated about 15 kilometres (9.3 mi) in less than a century, and dense, diverse vegetation has become established on the slopes.The retreat of glaciers since 1850 is a well-documented effect of climate change. The retreat of mountain glaciers provides evidence for the rise in global temperatures since the late 19th century.
Ice sheetLarge mass of glacial iceOne of Earth's two ice sheets: The Antarctic ice sheet covers about 98% of the Antarcticcontinent and is the largest single mass of ice on Earth. It has an average thickness of over 2 kilometers.In glaciology, an ice sheet, also known as a continental glacier, is a mass of glacialice that covers surrounding terrain and is greater than 50,000 km (19,000 sq mi). The two current ice sheets are the Antarctic ice sheet and the Greenland ice sheet.
Last Glacial MaximumThe Last Glacial Maximum (LGM), also referred to as the Last Glacial Coldest Period, was the most recent time during the Last Glacial Period where ice sheets were at their greatest extent between 26,000 and 20,000 years ago. Ice sheets covered much of Northern North America, Northern Europe, and Asia and profoundly affected Earth's climate by causing a major expansion of deserts, along with a large drop in sea levels.
Sea level riseRise in sea levels due to climate changeThe global average sea level has risen about 25 centimetres (9.8 in) since 1880. Sea surface height change from 1992 to 2019: Blue regions are where sea level has gone down, and orange/red regions are where sea level has risen (the visualization is based on satellite data).The sea level has generally been rising since the end of the Last Glacial Maximum, which was around 20,000 years ago.
CryosphereThe cryosphere is an umbrella term for those portions of Earth's surface where water is in solid form. This includes sea ice, ice on lakes or rivers, snow, glaciers, ice caps, ice sheets, and frozen ground (which includes permafrost). Thus, there is an overlap with the hydrosphere. The cryosphere is an integral part of the global climate system. It also has important feedbacks on the climate system.
Climate changeHuman-caused changes to climate on EarthChanges in surface air temperature over the past 50 years. The Arctic has warmed the most, and temperatures on land have generally increased more than sea surface temperatures.Earth's average surface air temperature has increased about 1.5 °C (2.7 °F) since the Industrial Revolution.
InterglacialAn interglacial period (or alternatively interglacial, interglaciation) is a geological interval of warmer global average temperature lasting thousands of years that separates consecutive glacial periods within an ice age. The current Holocene interglacial began at the end of the Pleistocene, about 11,700 years ago.
GlacierPersistent body of ice that moves downhill under its own weightGlacier of the Geikie Plateau in GreenlandThe Taschachferner in the Ötztal Alps in Austria. The mountain to the left is the Wildspitze (3,768 m), the second highest in AustriaThe Baltoro Glacier in Pakistan. It is 62 kilometres (39 mi) long, the fifth longest alpine glacier in the world.A glacier (US: ; UK: or ) is a persistent body of natural ice, a form of rock, that is constantly moving under its own weight.
HoloceneCurrent geological epochSubdivision of the Holocene according to the ICS, as of 2024.Vertical axis scale: Gregorian yearsEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitEpochStratigraphic unitSeriesTime span formalityFormalLower boundary definitionEnd of the Younger Dryasstadial.Lower boundary GSSPNGRIP2 ice core, Greenland75°06′00″N42°19′12″W / 75.1000°N 42.3200°W / 75.1000; -42.3200Lower GSSP ratified2008Upper boundary definitionPresent dayUpper boundary GSSPN/AN/AUpper GSSP ratifiedN/AThe Holocene () is the current geological epoch, beginning approximately 11,700 years ago.
EarthThird planet from the SunSurface equivalent doserate0.274 μSv/hAbsolute magnitude (H)−3.99AtmosphereSurface pressure101.325 kPa (at sea level)Composition by volume78.08% nitrogen (dry air)20.95% oxygen (dry air)≤1% water vapor (variable)0.9340% argon0.0430% carbon dioxide0.00182% neon0.00052% helium0.00017% methane0.00011% krypton0.00006% hydrogen Source:Earth is the third planet from the Sun and the only astronomical object known to harbor life.
Ice ageAn ice age is a period of time when decreased temperature of Earth's surface and atmosphere results in the prolonged presence or expansion of continental alpine glaciers and polar ice caps. The term is applied in several different senses to very long and comparatively short periods of cooling.
AblationAblation (Latin: ablatio – removal) is the removal or destruction of something from an object by vaporization, abrasion, erosive processes, or other means. The object may be fully ablated away. Examples of ablation as it is relevant to various industries are described below, including spacecraft material for ascent and atmospheric reentry, ice and snow in glaciology, biological tissues in medicine, and passive fire protection materials.*As an Amazon Associate I earn from qualifying purchases.