The fragility of periglacial areas and their susceptibility to human impact

Periglacial areas, found in cold environments near glacial regions, are extremely delicate ecosystems that face significant risks from human activities such as mineral extraction. Their vulnerability stems from unique environmental characteristics that make recovery from disturbances slow and difficult.

Reasons for the fragility of periglacial ecosystems

• Limited biodiversity - With only a small number of species present, any disruption can have a profound impact on the entire ecosystem.
• Slow decomposition rates - The bitterly cold temperatures hinder the breakdown of organic matter, meaning pollution lingers in the environment for extended periods.
• Permafrost vulnerability - Permafrost, the permanently frozen ground, is easily disturbed by heat from infrastructure like buildings or pipelines, as well as by changes in vegetation cover. This thawing leads to subsidence.
• Frost heave near rivers - Close to water sources, where moisture is plentiful, frost heave can displace structures and pipelines. To counteract this, supports for oil pipelines must be deeply embedded into the permafrost, often at great expense. For example, in Prudhoe Bay, Alaska, supports are sunk to depths of around 11 metres, costing over $3000 each in the early 1970s.

Human impacts and associated hazards in cold environments

The exploitation of cold environments for mineral resources introduces a range of hazards, many of which are worsened by human activities. These challenges make development in such regions particularly complex and risky.

Hazards intensified by human activity

• Mass movements - Disturbances to the ground, such as mining or construction, can trigger landslides or slumps in unstable permafrost areas.
• Flooding risks - Changes to drainage patterns or melting permafrost due to human infrastructure can lead to sudden flooding events.
• Thermokarst subsidence - Thawing permafrost creates uneven sinking of the ground, forming thermokarst landscapes that damage structures and roads.
• Extreme low temperatures - Harsh cold affects both human workers and machinery, slowing operations and increasing maintenance costs.
• Poor soil quality - Thin, infertile soils hinder any attempts at revegetation or recovery after disturbance.
• Short growing season - The brief period of warmth limits plant regrowth, slowing environmental recovery after human impact.
• Limited daylight - Long periods of darkness in winter reduce working hours and complicate operations in remote areas.

Challenges of constructing pipelines in permafrost regions

Building pipelines in cold environments with permafrost presents significant engineering challenges due to the unstable ground and extreme conditions. Innovative designs are required to prevent environmental damage and ensure operational safety.

Design solutions for pipelines in permafrost areas

• Above-ground pipelines - In areas with unstable permafrost, pipelines are often elevated on supports to avoid direct contact with the ground. Key features include:
  • Vertical supports embedded deep into the permafrost to resist frost heave.
  • Cooling systems, such as liquid ammonia pipes, to disperse heat in summer and maintain frozen ground.
  • Insulation with materials like fibreglass to keep oil warm and flowing during winter shutdowns.
  • Flexible designs, such as zig-zag layouts and Teflon-coated supports, allowing the pipe to expand, contract, or adjust to seismic activity.
  • Safety mechanisms like automatic valves to limit oil spillage in case of fractures, restricting leaks to an estimated 15,000 barrels on average.
• Buried pipelines - Where above-ground structures might obstruct wildlife migration, such as caribou routes, pipelines are buried with specific adaptations:
  • Insulation layers to protect the surrounding permafrost.
  • Refrigerated brine circulated through smaller pipes to keep the ground frozen and prevent thawing.
• High costs and risks - Both methods involve substantial financial investment due to the need for specialised materials and engineering. Additionally, any failure in design can lead to environmental disasters through oil spills or ground destabilisation.

Resource nationalism and development challenges in Greenland

Greenland, a cold environment with vast potential for mineral extraction, faces unique physical and political challenges in developing its resources. Its push for control over natural assets highlights both opportunities and obstacles.

Physical and infrastructural barriers in Greenland

• Geographical isolation - Greenland's remote location in the Arctic limits accessibility, with much of the terrain difficult to navigate.
• Ice coverage - Approximately 80% of the land is covered by a thick ice sheet, restricting areas available for development.
• Sparse population and infrastructure - The capital, Nuuk, has a population of only around 16,000, and the country lacks extensive human and physical infrastructure to support rapid growth.
• Limited connectivity - There are no roads linking the scattered communities, and transportation often relies on a single ship servicing western settlements, hampering logistics for resource extraction.

Political context and resource nationalism

• Historical mining - Greenland has a legacy of resource extraction, with cryolite mining occurring for over a century from 1857 to 1987.
• Home rule achievement - In 2009, Greenland gained full control over its natural resources through home rule, although Denmark retains authority over security and foreign affairs. This shift was anticipated to bring significant economic benefits.
• Economic setbacks - The collapse of oil prices since 2013 has rendered Arctic oil exploration financially unviable, stalling many development plans.

Implications of resource development

• Economic potential - Control over resources offers Greenland a chance to boost its economy through mining and oil exploration, potentially reducing dependence on external support.
• Environmental and social conflicts - Development in such a fragile environment risks damaging ecosystems and disrupting traditional ways of life, creating tension between economic goals and sustainability.
• Global market dependence - The fluctuating value of resources like oil illustrates how Greenland's aspirations for economic independence are tied to international economic conditions, posing ongoing challenges.