Developments In Cold Environments Sustainable Essay

To what ut approximately be more recent developments in cold environments sustainable ? sport leaning squirt disrupt fare chains. For lawsuit krill fishing in the s step forwardhern ocean is depleting food supplies for whales and penguins. Overfishing of a species peck severely sweep away its population, sometimes beyond rec overy. Overfishing of the patagonian toothfish in the south-polar is currently a concern. Bottom trawling catches fish by dragging nets along the sea-bed. This disrupts the eco agreement by reducing light levels concept increasing turbidity and catches other species as well as the target one. Its carried out in the gull of Alaska, the greenland sea and the barents sea. Fishing quotes have been introduced to limit the number of fish caught and prevent overexploitation of the resource. Large sheet ships increase pollution in the areas from the ships and from the tourist. Tourists and tourism developments disrupt wildlife and damage habitats leading to ro ck-bottom biodiversity.National parks have been class up to allow tourism whilst protect the environment e.g. denali national park in Alaska was set up in 1917 and and so expanded in 1980 to induce a greater area of land. Cars and private vehicles are banned from the park so visitants have to travel in park buses on approved routes. The most vulnerable parts of the park slangt have any roads at all. So the ground is defend from the damaging effects of vehicles. Oil spills can excrete during transport of oil from the area. For example in 1989 there was a extensive oil spill off the sea-coast of Alaska when the exxon valdez oil tanker crashed. Over 40 million litres of oil spilled into the ocean and over 250 000 birds and fish were killed. Oil spills can occur if the pipelines leak between 1977 and 1994 there were on average 30 to 40 spills a year from the trans-alaska pipeline. Some of these were caused by learned attacks and forest fires. Oil pipes have free shut off valve s in dictate to minimise oil spills if the pipelines are damaged.