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 1. 
 2. / Live news


GLACIER LAKES SWOLLEN BY GLOBAL WARMING THREATEN MILLIONS



Issued on: 07/02/2023 - 17:02

A resident removes a door from a house damaged by a glacier lake outburst in
Pakistan's Gilgit-Baltistan region. Pakistan is home to more than 7,000 glaciers
© Abdul MAJEED / AFP/File
3 min

Paris (AFP) – Violent flooding from glacier lakes formed or enlarged by climate
change threatens at least 15 million people worldwide, most of them in four
countries, researchers said Tuesday.

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More than nine million people across so-called High Mountain Asia live in the
path of potential glacial lake outburst floods, including five million in
northern India and Pakistan, they reported in Nature Communications.

China and Peru are also especially exposed to the danger of abrupt flooding from
melting glaciers, according to the study, the first global assessment of areas
most at risk.

The volume of lakes formed as glaciers worldwide disintegrate due to global
warming has jumped by 50 percent in 30 years, according to a 2020 study based on
satellite data.

Earth's average surface temperature has risen nearly 1.2 degrees Celsius since
preindustrial times, but high-mountain regions around the world have warmed at
twice that pace.

Glacier lakes are particularly unstable because they are most often dammed by
ice or sediment composed of loose rock and debris. When accumulating water
bursts through these accidental barriers, massive flooding can occur downstream.

This kind of flooding has been responsible for thousands of deaths in the last
century, as well as the destruction of communities, infrastructure and
livestock.

"It's not the areas with the largest number or most rapidly growing lakes that
are most dangerous," said lead author Caroline Taylor, a doctoral student at
Newcastle University in England.

"Instead, it is the number of people, their proximity to a glacial lake, and,
importantly, their ability to cope with a flood that determines the potential
danger," she explained.

Worldwide population exposed to glacial lake outburst floods © Julia Han JANICKI
/ AFP

Thousands of people, for example, have been killed by glacier lake outburst
floods in High Mountain Asia but only a handful in North America's Pacific
Northwest, even though that region has twice as many glacial lakes.

To carry out the study, Taylor and her colleagues compared three sets of data:
the number and condition of lakes fed by melt-water, the number of people living
within 50 kilometres of a glacial lake basin, and how prepared communities are
to cope with disaster should it arrive.

Some 90 million people across 30 countries live in 1,089 glacial lake basins,
they found. 15 million of them reside within one kilometre of the track an
outburst flood would take.


EXPOSURE VS. VULNERABILITY

Pakistan is home to more than 7,000 glaciers in the spectacular Himalaya, Hindu
Kush and Karakoram mountain ranges, more than anywhere else on Earth outside the
poles.

Last summer, on the heels of a two-month heat wave and during sustained rains
that followed, raging torrents from melting glaciers in northern Pakistan ripped
up thousands of kilometres of roads and railway tracks, destroyed bridges, and
washed away entire villages.

In Peru, a 41-year-old farmer who lives in mountains near the city of Huaraz has
filed suit against the German firm RWE, saying its greenhouse gas emissions are
partly responsible for the melting of nearby glaciers.

Saul Luciano Lliuya next to Palcacocha Lake in the Peruvian Andes. Lliuya, a
farmer, is suing RWE in a German court, alleging that the Germain energy giant
has helped swell the lake, which threatens the town below it © Luka GONZALES /
AFP/File

Last year a delegation of German judges visited the region to determine what
risk the expanding lake below the Palcacocha glacier poses to city of Huaraz and
its 120,000 inhabitants.

Half of the Earth's 215,000 glaciers and a quarter of their mass will melt away
by the end of the century even if global warming can be capped at 1.5 degrees
Celsius, the ambitious Paris Agreement target that many scientists now say is
beyond reach, a recent study found.

Over the past century, a third of global sea-level rises came from glacier melt,
according to earlier research.

© 2023 AFP





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