| Αυτή η σελίδα είναι το κύριο «πρόχειρο χρήστη» του Trikos. Ένα «πρόχειρο χρήστη» είναι υποσελίδα της προσωπικής σελίδας του χρήστη στη Βικιπαίδεια. Εξυπηρετεί ως χώρος πειραματισμών και ανάπτυξης σελίδων και δεν είναι εγκυκλοπαιδικό λήμμα.
Επεξεργαστείτε ή δημιουργήστε το δικό σας πρόχειρο εδώ ή κάνετε δοκιμές στο κοινόχρηστο Πρόχειρο Βικιπαίδειας.
Δημιουργία νέας σελίδας:
Οι Περιβαλλοντικές επιπτώσεις της ναυτιλίας περιλαμβάνουν τις εκπομπές αέριων θερμοκηπίου, την ηχορρύπανση και την ρύπανση από πετρέλαιο από τις δραστηριότητες της ναυτιλίας. Μάλιστα, σύμφωνα με εκτιμήσεις του Διεθνή Οργανισμού Ναυσιπλοΐας, οι εκπομπές [[Διοξείδιο του άνθρακα |διοξειδίου του άνθρακα]] από τη ναυτιλία ανέρχονται στο 2,2% των συνολικών ανθρωπογενών εκπομπών το 2012 και αναμένεται να αυξηθούν κατά 50-250% μέχρι το 2050 εάν δεν ληφθούν μέτρα.
Η πρώτη διεθνής συνάντηση της ομάδας εργασίας του Διεθνή Οργανισμού Ναυσιπλοΐας έλαβε χώρα στο Όσλο από τις 23 μέχρι τις 27 Ιουνίου 2008. Αντικείμενο συζήτησης ήταν οι εκπομπές αερίων θερμοκηπίου. Η ομάδα έχει αναλάβει την ανάπτυξη ορισμένων προτύπων για τη μείωση των αέριων ρύπων που παράγονται από τη ναυτιλία.
Νερό έρματος[Επεξεργασία | επεξεργασία κώδικα]
Τα κρουαζιερόπλοια , τα μεγάλα δεξαμενόπλοια και τα μπαλκ κάριερς χρησιμοποιούν μεγάλες ποσότητες νερού για τον ερματισμό τους, το οποίο συνήθως το παίρνουν από τις παράκτιες θάλασσες. Όταν το ξαναρίχνουν στη θάλασσα, το νερό συνήθως περιέχει μια ποικιλία βιολογικών ειδών, όπως φυτά, ζώα, ιούς και βακτήρια, που μπορούν να προκαλέσουν εκτεταμένες οικολογικές και οικονομικές καταστροφές στα υδρόβια οικοσυστήματα καθώς και σοβαρά προβλήματα υγείας.
Sound pollution[Επεξεργασία | επεξεργασία κώδικα]
Noise pollution caused by shipping and other human enterprises has increased in recent history. The noise produced by ships can travel long distances, and marine species who may rely on sound for their orientation, communication, and feeding, can be harmed by this sound pollution.
The Convention on the Conservation of Migratory Species has identified ocean noise as a potential threat to marine life. The disruption of whales' ability to communicate with one another is an extreme threat and is affecting their ability to survive. According to Discovery Channel's article on Sonic Sea Journeys Deep Into the Ocean, over the last century, extremely loud noise from commercial ships, oil and gas exploration, naval sonar exercises and other sources has transformed the ocean's delicate acoustic habitat, challenging the ability of whales and other marine life to prosper and ultimately to survive. Whales are starting to react to this in ways that are life-threatening. Kenneth C. Balcomb, a whale researcher and a former U.S Navy officer, states that the day March 15, 2000, is the day of infamy. As Discovery says, where him and his crew discovered whales swimming dangerously close to the shore. They're supposed to be in deep water. So I pushed it back out to sea, says Balcomb. Although sonar helps to protect us, it is destroying marine life. According to IFAW Animal Rescue Program Director Katie Moore, "There's different ways that sounds can affect animals. There's that underlying ambient noise level that's rising, and rising, and rising that interferes with communication and their movement patterns. And then there's the more acute kind of traumatic impact of sound, that's causing physical damage or a really strong behavioral response. It's fight or flight".
Wildlife collisions[Επεξεργασία | επεξεργασία κώδικα]
Marine mammals, such as whales and manatees, risk being struck by ships, causing injury and death. For example, if a ship is traveling at a speed of only 15 knots, there is a 79 percent chance of a collision being lethal to a whale.
One notable example of the impact of ship collisions is the endangered North Atlantic right whale, of which 400 or less remain. The greatest danger to the North Atlantic right whale is injury sustained from ship strikes. Between 1970 and 1999, 35.5 percent of recorded deaths were attributed to collisions. During 1999 to 2003, incidents of mortality and serious injury attributed to ship strikes averaged one per year. In 2004 to 2006, that number increased to 2.6. Deaths from collisions has become an extinction threat. The United States' National Marine Fisheries Service (NMFS) and National Oceanic and Atmospheric Administration (NOAA) introduced vessel speed restrictions to reduce ship collisions with North Atlantic right whales in 2008, which expired in 2013. However, in 2017 an unprecedented mortality event occurred, resulting in the deaths of 17 North Atlantic Right Whales caused primarily from ship-strikes and entanglement in fishing gear.
Atmospheric pollution[Επεξεργασία | επεξεργασία κώδικα]
There is a perception that cargo transport by ship is low in air pollutants, because for equal weight and distance it is the most efficient transport method, according to shipping researcher Alice Bows-Larkin. This is particularly true in comparison to air freight; however, because sea shipment accounts for far more annual tonnage and the distances are often large, shipping's emissions are globally substantial. A difficulty is that the year-on-year increasing amount shipping overwhelms gains in efficiency, such as from slow-steaming or the use of kites. The growth in tonne-kilometers of sea shipment has averaged 4 percent yearly since the 1990s. And it has grown by a factor of 5 since the 1970s. There are now over 100,000 transport ships at sea, of which about 6,000 are large container ships.
Conventional pollutants[Επεξεργασία | επεξεργασία κώδικα]
Air pollution from cruise ships is generated by diesel engines that burn high sulfur content fuel oil, also known as bunker oil, producing sulfur dioxide, nitrogen oxide and particulate, in addition to carbon monoxide, carbon dioxide, and hydrocarbons. Diesel exhaust has been classified by EPA as a likely human carcinogen. EPA recognizes that these emissions from marine diesel engines contribute to ozone and carbon monoxide nonattainment (i.e., failure to meet air quality standards), as well as adverse health effects associated with ambient concentrations of particulate matter and visibility, haze, acid deposition, and eutrophication and nitrification of water. EPA estimates that large marine diesel engines accounted for about 1.6 percent of mobile source nitrogen oxide emissions and 2.8 percent of mobile source particulate emissions in the United States in 2000. Contributions of marine diesel engines can be higher on a port-specific basis. Ultra-low sulfur diesel (ULSD) is a standard for defining diesel fuel with substantially lowered sulfur contents. As of 2006, almost all of the petroleum-based diesel fuel available in Europe and North America is of a ULSD type.
In 2016 the IMO has made new sulfur regulations which must be implemented by larger ships by 2020.
Of total global air emissions, shipping accounts for 18 to 30 percent of the nitrogen oxide and 9 percent of the sulphur oxides. Sulfur in the air creates acid rain which damages crops and buildings. When inhaled, sulfur is known to cause respiratory problems and even increases the risk of a heart attack. According to Irene Blooming, a spokeswoman for the European environmental coalition Seas at Risk, the fuel used in oil tankers and container ships is high in sulfur and cheaper to buy compared to the fuel used for domestic land use. "A ship lets out around 50 times more sulfur than a lorry per metric tonne of cargo carried." Cities in the U.S. like Long Beach, Los Angeles, Houston, Galveston, and Pittsburgh see some of the heaviest shipping traffic in the nation and have left local officials desperately trying to clean up the air. Increasing trade between the U.S. and China is helping to increase the number of vessels navigating the Pacific and exacerbating many of the environmental problems. To maintain the level of growth China is experiencing, large amounts of grain are being shipped to China by the boat load. The number of voyages are expected to continue increasing.
Greenhouse gas pollutants[Επεξεργασία | επεξεργασία κώδικα]
As one way to reduce the impact of greenhouse gas emissions from shipping, vetting agency RightShip developed an online "Greenhouse Gas (GHG) Emissions Rating" as a systematic way for the industry to compare a ship's CO2 emissions with peer vessels of a similar size and type. Based on the International Maritime Organisation's (IMO) Energy Efficiency Design Index (EEDI) that applies to ships built from 2013, RightShip's GHG Rating can also be applied to vessels built prior to 2013, allowing for effective vessel comparison across the world's fleet. The GHG Rating utilises an A to G scale, where A represents the most efficient ships. It measures the theoretical amount of carbon dioxide emitted per tonne nautical mile travelled, based on the design characteristics of the ship at time of build such as cargo carrying capacity, engine power and fuel consumption. Higher rated ships can deliver significantly lower CO2 emissions across the voyage length, which means they also use less fuel and are cheaper to run.
Stress for improvement[Επεξεργασία | επεξεργασία κώδικα]
One source of environmental stresses on maritime vessels recently has come from states and localities, as they assess the contribution of commercial marine vessels to regional air quality problems when ships are docked at port. For instance, large marine diesel engines are believed to contribute 7 percent of mobile source nitrogen oxide emissions in Baton Rouge/New Orleans. Ships can also have a significant impact in areas without large commercial ports: they contribute about 37 percent of total area nitrogen oxide emissions in the Santa Barbara area, and that percentage is expected to increase to 61 percent by 2015. Again, there is little cruise-industry specific data on this issue. They comprise only a small fraction of the world shipping fleet, but cruise ship emissions may exert significant impacts on a local scale in specific coastal areas that are visited repeatedly. Shipboard incinerators also burn large volumes of garbage, plastics, and other waste, producing ash that must be disposed of. Incinerators may release toxic emissions as well.
In 2005, MARPOL Annex VI came into force to combat this problem. As such cruise ships now employ CCTV monitoring on the smokestacks as well as recorded measuring via opacity meter while some are also using clean burning gas turbines for electrical loads and propulsion in sensitive areas.
Oil spills[Επεξεργασία | επεξεργασία κώδικα]
Most commonly associated with ship pollution are oil spills. While less frequent than the pollution that occurs from daily operations, oil spills have devastating effects. While being toxic to marine life, polycyclic aromatic hydrocarbons (PAHs), the components in crude oil, are very difficult to clean up, and last for years in the sediment and marine environment. Marine species constantly exposed to PAHs can exhibit developmental problems, susceptibility to disease, and abnormal reproductive cycles. One of the more widely known spills was the Exxon Valdez incident in Alaska. The ship ran aground and dumped a massive amount of oil into the ocean in March 1989. Despite efforts of scientists, managers and volunteers, over 400,000 seabirds, about 1,000 sea otters, and immense numbers of fish were killed.
International regulation[Επεξεργασία | επεξεργασία κώδικα]
Some of the major international efforts in the form of treaties are the Marine Pollution Treaty, Honolulu, which deals with regulating marine pollution from ships, and the UN Convention on Law of the Sea, which deals with marine species and pollution. While plenty of local and international regulations have been introduced throughout maritime history, much of the current regulations are considered inadequate. "In general, the treaties tend to emphasize the technical features of safety and pollution control measures without going to the root causes of sub-standard shipping, the absence of incentives for compliance and the lack of enforceability of measures." The most common problems encountered with international shipping arise from paperwork errors and customs brokers not having the proper information about your items. Cruise ships, for example, are exempt from regulation under the US discharge permit system (NPDES, under the Clean Water Act) that requires compliance with technology-based standards. In the Caribbean, many ports lack proper waste disposal facilities, and many ships dump their waste at sea. Moreover, due to the complexities of shipping trade and the difficulties involved in regulating this business, a comprehensive and generally acceptable regulatory framework on corporate responsibility for reducing GHG emissions is unlikely to be achieved soon. In fact, emissions are continuing to increase. Under these circumstances, it is necessary for the states, the shipping industry and global organizations to explore and discuss market based mechanisms for vessel-sourced GHG emissions reduction.
Sewage[Επεξεργασία | επεξεργασία κώδικα]
The cruise line industry dumps 255,000 US gallons (970 m3) of greywater and 30,000 US gallons (110 m3) of blackwater into the sea every day. Blackwater is sewage, wastewater from toilets and medical facilities, which can contain harmful bacteria, pathogens, viruses, intestinal parasites, and harmful nutrients. Discharges of untreated or inadequately treated sewage can cause bacterial and viral contamination of fisheries and shellfish beds, producing risks to public health. Nutrients in sewage, such as nitrogen and phosphorus, promote excessive algal blooms, which consumes oxygen in the water and can lead to fish kills and destruction of other aquatic life. A large cruise ship (3,000 passengers and crew) generates an estimated 55,000 to 110,000 liters per day of blackwater waste.
Due to the environmental impact of shipping, and sewage in particular marpol annex IV was brought into force September 2003 strictly limiting untreated waste discharge. Modern cruise ships are most commonly installed with a membrane bioreactor type treatment plant for all blackwater and greywater, such as (https://web.archive.org/web/20130408054426/http://www.gertsen-olufsen.com/Ship-Offshore/Products/G-O_Brands/G-O_Bioreactor.aspx), Zenon or Rochem which produce near drinkable quality effluent to be re-used in the machinery spaces as technical water.
Cleaning[Επεξεργασία | επεξεργασία κώδικα]
Greywater is wastewater from the sinks, showers, galleys, laundry, and cleaning activities aboard a ship. It can contain a variety of pollutant substances, including fecal coliforms, detergents, oil and grease, metals, organic compounds, petroleum hydrocarbons, nutrients, food waste, medical and dental waste. Sampling done by the EPA and the state of Alaska found that untreated greywater from cruise ships can contain pollutants at variable strengths and that it can contain levels of fecal coliform bacteria several times greater than is typically found in untreated domestic wastewater. Greywater has potential to cause adverse environmental effects because of concentrations of nutrients and other oxygen-demanding materials, in particular. Greywater is typically the largest source of liquid waste generated by cruise ships (90 to 95 percent of the total). Estimates of greywater range from 110 to 320 liters per day per person, or 330,000 to 960,000 liters per day for a 3,000-person cruise ship.
Solid waste[Επεξεργασία | επεξεργασία κώδικα]
Solid waste generated on a ship includes glass, paper, cardboard, aluminium and steel cans, and plastics. It can be either non-hazardous or hazardous in nature. Solid waste that enters the ocean may become marine debris, and can then pose a threat to marine organisms, humans, coastal communities, and industries that utilize marine waters. Cruise ships typically manage solid waste by a combination of source reduction, waste minimization, and recycling. However, as much as 75 percent of solid waste is incinerated on board, and the ash typically is discharged at sea, although some is landed ashore for disposal or recycling. Marine mammals, fish, sea turtles, and birds can be injured or killed from entanglement with plastics and other solid waste that may be released or disposed off of cruise ships. On average, each cruise ship passenger generates at least two pounds of non-hazardous solid waste per day. With large cruise ships carrying several thousand passengers, the amount of waste generated in a day can be massive. For a large cruise ship, about 8 tons of solid waste are generated during a one-week cruise. It has been estimated that 24 percent of the solid waste generated by vessels worldwide (by weight) comes from cruise ships. Most cruise ship garbage is treated on board (incinerated, pulped, or ground up) for discharge overboard. When garbage must be off-loaded (for example, because glass and aluminium cannot be incinerated), cruise ships can put a strain on port reception facilities, which are rarely adequate to the task of serving a large passenger vessel.
Bilge water[Επεξεργασία | επεξεργασία κώδικα]
On a ship, oil often leaks from engine and machinery spaces or from engine maintenance activities and mixes with water in the bilge, the lowest part of the hull of the ship, but there is a filter to clean bilge water before being discharged. Oil, gasoline, and by-products from the biological breakdown of petroleum products can harm fish and wildlife and pose threats to human health if ingested. Oil in even minute concentrations can kill fish or have various sub-lethal chronic effects. Bilge water also may contain solid wastes and pollutants containing high levels of oxygen-demanding material, oil and other chemicals. A typically large cruise ship will generate an average of 8 metric tons of oily bilge water for each 24 hours of operation. To maintain ship stability and eliminate potentially hazardous conditions from oil vapors in these areas, the bilge spaces need to be flushed and periodically pumped dry. However, before a bilge can be cleared out and the water discharged, the oil that has been accumulated needs to be extracted from the bilge water, after which the extracted oil can be reused, incinerated, and/or offloaded in port. If a separator, which is normally used to extract the oil, is faulty or is deliberately bypassed, untreated oily bilge water could be discharged directly into the ocean, where it can damage marine life. A number of cruise lines have been charged with environmental violations related to this issue in recent years.
References[Επεξεργασία | επεξεργασία κώδικα]
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- Σφάλμα αναφοράς: Σφάλμα παραπομπής: Λανθασμένο
<ref>. Δεν υπάρχει κείμενο για τις παραπομπές με όνομα
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- Bluewater Network, "Cruising for Trouble: Stemming the Tide of Cruise Ship Pollution," March 2000, p. 5. A report prepared for an industry group estimated that a 3,000-person cruise ship generates 1,1 million US gallons (4,200 m3) of graywater during a seven-day cruise. Don K. Kim, "Cruise Ship Waste Dispersion Analysis Report on the Analysis of Graywater Discharge," presented to the International Council of Cruise Lines, 14 September 2000.
- National Research Council, Committee on Shipboard Wastes, Clean Ships, Clean Ports, Clean Oceans: Controlling Garbage and Plastic Wastes at Sea (National Academy Press, 1995), Table 2-3, pp. 38-39.
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- Huettel, Steve (2004-04-14). «Liner may have dumped oily water, reports say». St. Petersburg Times. http://www.sptimes.com/2004/04/14/Business/Liner_may_have_dumped.shtml.
Further reading[Επεξεργασία | επεξεργασία κώδικα]
- Copeland, Claudia (6 February 2008). «Cruise Ship Pollution: Background, Laws and Regulations, and Key Issues». CRS Report for Congress. Order Code RL32450. (Washington, DC: Congressional Research Service). http://www.ncseonline.org/NLE/CRSreports/07Dec/RL32450.pdf.
- Maritime International Secretariat Services - Shipping Industry Guidance on Environmental Compliance
- GloBallast partnership (IMO)
- International Convention for the Control and Management of Ships' Ballast Water and Sediments, 2004 - IMO
- Cruise Ship Pollution Overview - Oceana
- Ecological facts on ballast water
- CO2 emissions calculator for transporting cargo by sea