Glacial Systems & Landscapes: Human impacts on Cold environments
- Created by: IssyCalderwood
- Created on: 06-04-19 14:04
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- Glacial systems & landscapes: Human impacts on cold environments
- Cold environments are fragile
- Decay = slow = pollutants broken down slowly = remain for long time
- Fragility = easy to damage, long time to recover
- Plants & animals adapted = hard to survive to environmental change
- Harsh climate = short growing season, don't have much recover time
- Plants grow slowly = repairing = long time
- Human activities have changed over time
- Centuries indigenous people (Inuit) adapted landscape& climate & pop = small
- Recent = environment exploited larger scale
- Activities = local area = immediate & long term effects = more damaging
- Oil extraction
- Oil spills during transport
- 1989, oil spill, Alaska, Exxon Valdez oil tanker, 40 million litres, 250,000 birds, fish killed
- Oil spills pipelines leak, 1977-1994 30-40 spills/year from Trans-Alaskan pipeline
- Some caused by intentional attacks & forest fires
- Oil spills during transport
- Fishing
- Disrupt food chains
- E.g. Krill, Southern Ocean = depleting whale & penguin food supplies
- Overfishing = deplete pop.
- E.g. Patagonian Toothfish
- Bottom trawling = disrupts ecosystem = catches other species
- Carried out in Gulf of Alaska, Greenland Sea & Barents Sea
- Disrupt food chains
- Tourism
- Cruise ships = pollution
- Tourists disrupt wildlife, damage habitats = reduced biodiversity
- Mining
- Chemicals during mining = ground & surface water contamination
- Lead-Zinc mine , Maarmorilik, closed 1990, lead-zinc pollution still high
- Produces solid waste & wastewater = rebased to environment = pollutes
- Chemicals during mining = ground & surface water contamination
- Hydroelectric power production
- Block migratory path to spawning grounds = pop. decrease
- Heats water = endangers fish adapted to cold
- Climate change is causing warming
- Current impacts
- Melting glaciers = sea levels rise
- Globally glaciers retreating
- Permafrost = melting = buildings collapse & ice roads usable for less time before they thaw
- Migration patterns changing e.g. caribou
- Predicted impacts
- Sea level rise = flood low level land
- Melting permafrost = positive feedback
- Methane released = temps rise = more released = further melting
- Plants & animals adapted = harder to survive in warm
- Other flora & fauna that prefer warm = extend into cold environments
- Current impacts
- Cold environments are managed but under pressure
- Strategies
- Protected areas = protected by laws prevent activities e.g. designated wilderness areas development forbidden, access limited
- International treaties = antarctic treaty, 12 countries, 1959, now has 53 signatories, states Antarctica used for peaceful purposes & science
- Monitoring & regulation = exploitation monitored, activities managed e.g. visitors to Antarctica disinfect footwear
- Fishing quotas = number of fish can be caught = limited
- Pressure on natural resources as tourist demand increasing
- Increased protection = 2015, USA, extending wilderness area of Alaska prevents oil exploration
- Decrease protection = pop increases & oil & minerals depleted, currently protected may be opened up
- Strategies
- Cold environments are fragile
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