Glacier volume in the Everest region has declined by half
At some point during this period (2048-2058), glacier volume in the Mount Everest region falls below 50% of its 2015 level.* The Earth had continued to warm in recent decades and High Mountain Asia – an area that included the Himalayas – was especially sensitive to temperature changes. The glaciers here contained the largest volume of ice outside the polar regions. With global temperatures now 2°C (3.6°F) higher than the pre-industrial average,* melting rates by mid-century have accelerated. In addition to more rapid ice loss, precipitation has changed from snow to rain at critical elevations where glaciers are concentrated. This has acted to reduce glacier growth and increase the areas exposed to melt.
The resulting changes in glacier volume have major impacts on the availability of water for local populations. Initially, the increased melting results in greater flows of water – but the ongoing retreat leads to a decline in warmer months before the monsoon, when rainfall is scarce. Another effect is the formation and growth of temporary lakes dammed by glacial debris. Avalanches and earthquakes can breach these dams, causing catastrophic floods in the basins downstream, with river flows 100 times greater than normal.
This has serious consequences for agriculture and hydroelectric power generation. Of particular concern is the effect on Pakistan and its relationship with neighbouring India,* both dependent on the glacier-fed water resources of the Himalayas. Tensions between the nuclear-armed countries are escalating markedly during this time,* as the water crisis deepens, made worse by ongoing population growth and ever-increasing demand.
A key aspect of these changes has been a steady increase in the freezing level, the elevation where mean monthly temperatures are 0°C. As of 2015, this varied between 3200m in January and 5500m in August. If global average temperatures were to continue rising, the potential increase in height of the freezing level was 800-1200m by 2100, causing a glacier volume loss of between 70% and 99%. However, massive geoengineering projects are perfected in the second half of the century* that will stabilise and eventually reduce the warming.
Antarctic Treaty comes up for review
is the last remaining unspoilt wilderness; untouched by the massive
industrialisation common everywhere else on the planet. It covers an
area of 13.7 million sq km (5.3 million sq miles) and is covered by
an ice sheet 4 km (2.5 miles) deep. It has no human inhabitants, other
than a small number of scientists in research stations.
icy continent is governed by the terms of the Antarctic Treaty, which
came into effect in 1961. This was signed by Argentina, Australia, Chile,
France, New Zealand, Norway, the UK, Belgium, Japan, South Africa, the
USA and Russia. The first seven of these countries have historic claims
to the continent (none of which are generally recognised) and the Treaty
preserves the status quo, neither recognising nor repudiating the old
claims, but forbidding their expansion in any way. The terms of the
Treaty also forbid the assertion of new claims.
of a hole in the ozone layer, and other concerns, led to the addition
of a new environmental protocol agreed in 1991. This entered force in
1998. It was intended to protect Antarctica's environment and ecosystems,
and included a total ban on the exploitation of mineral and energy resources,
as well as strict regulation of pollution and other damaging activities.
The protocol is open for review in 2048, exactly 50 years after it was implemented.*
changed in the last half century. Earth's population is over 50% larger, placing a substantial drain on the Earth's resources which
has become alarmingly obvious by now. Metal and mineral supplies continue to be an issue, even with large-scale recycling systems in place.* Despite objections from environmentalists, there is general consensus
among the international community that some limited exploitation of
Antarctica should be permitted within certain specially controlled areas.
Over the next few years, a new treaty is drawn up with modified clauses, though disputes continue over territorial boundaries.
significant logistical challenges to mining and mineral extraction in
the region – such as the isolation, extreme cold, rough seas and thick
ice sheet. However, new technologies look set to mitigate these problems,
including the use of robots, heavy automation and alternative methods
of drilling. In addition, climate change and the melting of ice is making
it possible to exploit some previously inaccessible areas of the western
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King crabs are infesting Antarctic marine ecosystems
In addition to humanity's increased presence resulting from the Antarctica Treaty review described above, certain animal species have also begun to move into and exploit the continent due to changing environmental conditions. King crabs are one such species. For tens of millions of years, icy cold waters had excluded shell-crushing fish and crustaceans from the continental shelf surrounding Antarctica. Rapid warming has now allowed predatory crustaceans to return. From the 1950s to the 2010s, the west coast of the Antarctic Peninsula witnessed a 3.2°C temperature rise – several times the global average. This allowed king crabs to move up the outer shelf, into shallower waters just 200 metres in depth. By the middle of the 21st century,* they are infesting many coastal areas along the Western Antarctic Peninsula. This is causing severe disruption to the food chain, with catastrophic consequences for unique seafloor communities in the region.*