The power of the wind has been used for centuries to directly drive various machines to perform such tasks as grinding wheat or pumping water. Recently, however, the wind has joined other natural forces such as water and steam as a viable method of generating electricity.

Traditional means of electricity generation using coal or oil-fueled plants have two major drawbacks; they pollute the environment and the fuels they use are inefficient and non-renewable. In response to growing environmental awareness, there have been calls for a greener alternative. Nuclear power, while more efficient and less polluting, is seen by many people as unacceptable, because of the danger of accidents such as those that happened at Chernobyl or Three Mile Island. Wind power, however, is clean, renewable and, with modern advances, surprisingly efficient.

In the 1970s Britain was in the forefront of research into wind power. The interest in wind diminished in the 1980s due to cheap North Sea oil, a strong pro-nuclear lobby and pricing structures that made it uneconomical to set up wind farms. Britain, the windiest country in Europe, had to wait until 1991 for its first wind farm. Located at Delabole in Cornwall, the farm was originally the idea of locals who opposed the construction of a nuclear power plant nearby and decided to set up a private company to generate power for the area using the wind. They had to fight opposition from local government and other local residents, who thought the turbines would be noisy and might interfere with television signals, but eventually, after showing local officials working wind farms in Denmark, they won and now there are 10 huge white wind turbines on the Delabole hills.

It is in Germany and Denmark that the greatest advances in wind power have come. Germany alone produces half of the wind generated electricity in Europe. Every year Germany adds 400 Megawatts (Mw) of capacity. In 2000 alone capacity expanded by 1669 Mw. Denmark now produces 30% of its electricity from wind power and this is predicted to rise to 50% by 2010. Both countries have encouraged this growth by “fixed feed tariffs” which guarantee a good price for private wind power operators.

The UK is catching up and the government has set a target 10% of all electricity to come from renewable sources by 2010, half of this to be from wind power. The 900 wind turbines in operation generate 400Mw of electricity and to meet the target roughly 400Mw will need to be added each year. With the advances in technology, this is technically possible. Each turbine can now produce 400 Kilowatts (KW) compared to only 70 KW at the start of the 1980s. It will, however, need help from the government. This is being done by offering financial support and giving private power companies targets to meet.

Because many people feel wind farms spoil the view and, also, because the wind is stronger at sea, many wind farms are now being built offshore. They are usually built a few kilometres off the coast in shallow water. The construction and maintenance costs are higher, but electricity output is higher. The first in Britain was built in 2000 at Blyth, north of Newcastle, and was the largest in the world until May 2001, when a 20 turbine farm was opened at Middelgruden off Copenhagen. There are plans to construct up to 18 more in the UK by 2010. Together they will produce 800 Mw of electricity annually.

The use of wind power is far less advanced in the USA. Only .5% of America’s power comes from the wind, although it is estimated that this could be increased to as high as 12% with no changes to the power grid. However, there is an increased interest in wind power. There are plans to build a huge offshore wind farm off the coast of Cape Cod on the North East seaboard. The farm will take up over 25 square miles, have 170 turbines and produce 420Mw at a cost of $600m. If constructed, it will be the world’s second biggest wind farm, after the 520Mw farm planned in Ireland.

E One of the major causes seems to be the passenger’s behavior or their personality. Fear of flying and the feeling of powerlessness associated with flying can lead to irritable or aggressive passengers. Also, alcohol consumed on a plane pressurized to 8000ft affects the drinker more quickly and the effects are stronger. Many people do not take account of this and drinking may increase any negative reaction to the flying environment they have, which, combined with the lowering of their inhibitions, may cause air rage. Smoking withdrawal, which some liken in severity to opiate withdrawal, is another major cause of air rage incidents. Passengers caught smoking in the toilets occasionally assault flight attendants and have been known to start fires. When conflicts occur in these conditions, they can escalate into major incidents if the passenger has a violent personality or a fear of flying and because of the enclosed nature of a plane offers no option of retreat as would be natural in a “fight or flight” reaction.

F Some people feel that the physical environment of a plane can lead to air rage. Seats on most airlines have become smaller in recent years as airlines try to increase profits. This leads to uncomfortable and irritated passengers. Also, space for carry on luggage is often very small. Because up to 8% of checked in luggage is lost, misdirected or stolen, passengers have been trying to fit larger carry on items into these small storage areas and this can lead to disputes that can escalate into air rage. Airlines could also be to blame by raising passengers’ expectations too high with their marketing and advertising. Many air rage incidents start when disappointed passengers demand to be reseated. Finally, there is some evidence to show that low oxygen levels can raise aggression level and make people feel more desperate. Airlines have lowered oxygen levels to save money. Now the level of oxygen in the air that the pilots breathe is ten times higher than in cabin class.

G Another reason that has been suggested is that society is getting ruder and less patient. The increased congestion at airports, longer queues and increased delays have only added to this. In addition, some air rage incidents have been linked to the demanding nature of high achieving business people, who do not like people telling them what to do and resent the power that the cabin staff have over them. For them, a flight attendant is a waiter or waitress who should do what the passenger wants.

H The strongest calls for action to control air rage have come from pilots and aircrew. The International Transport Workers’ Federation argues that there are too many loopholes that let people escape punishment and that the penalties are too light. They want to notify all passengers of the penalties for air rage before taking off, rather than after the passenger begins to cause serious problems, when it may be too late. The Civil Aviation Organisation has been organizing international cooperation and penalties have increased in recent years. The most severe punishment so far has been a 51 month jail sentence, a fine to pay for the jet fuel used and 200 hours community service for a man who attempted to enter the cockpit and to open the emergency door of a domestic US flight.

I Various other measures are being used to control air rage. Aircrews are getting training on how to calm passengers and how to predict where incidents might result in air rage and take action to prevent this. Other measures include strengthening doors to stop people entering the cockpit, training crew in the use of plastic restraints to tie down unruly passengers and having pilots divert their planes if passengers cause problems. Banning passengers who are guilty of air rage from flying has also been tried to a lesser extent.

Though penguins are assumed to be native to the South Pole, only four of the seventeen species have evolved the survival adaptations necessary to live and breed in the Antarctic year round. The physical features of the Adelie, Chinstrap, Gentoo, and Emperor penguins equip them to withstand the harshest living conditions in the world. Besides these four species, there are a number of others, including the yellow feathered Macaroni penguin and the King penguin that visit the Antarctic regularly but migrate to warmer waters to breed. Penguins that live in Antarctica year round have a thermoregulation system and a survival sense that allows them to live comfortably both on the ice and in the water.

In the dark days of winter, when the Antarctic sees virtually no sunlight, the penguins that remain on the ice sheet sleep most of the day. To retain heat, penguins huddle in communities of up to 6,000 of their own species. When it’s time to create a nest, most penguins build up a pile of rocks on top of the ice to place their eggs. The Emperor penguin, however, doesn’t bother with a nest at all. The female Emperor lays just one egg and gives it to the male to protect while she goes off for weeks to feed. The male balances the egg on top of his feet, covering it with a small fold of skin called a brood patch. In the huddle, the male penguins rotate regularly so that none of the penguins have to stay on the outside of the circle exposed to the wind and cold for long periods of time. When it’s time to take a turn on the outer edge of the pack, the penguins tuck their feathers in and shiver. The movement provides enough warmth until they can head back into the inner core and rest in the warmth. In order to reduce the cold of the ice, penguins often put their weight on their heels and tails. Antarctic penguins also have complex nasal passages that prevent 80 percent of their heat from leaving the body. When the sun is out, the black dorsal plumage attracts its rays and penguins can stay warm enough to waddle or slide about alone.

Antarctic penguins spend about 75 percent of their lives in the water. A number of survival adaptations allow them to swim through water as cold as -2 degrees Celsius. In order to stay warm in these temperatures, penguins have to keep moving. Though penguins don’t fly in the air, they are often said to fly through water. Instead of stopping each time they come up for air, they use a technique called “porpoising,” in which they leap up for a quick breath while swiftly moving forward: Unlike most birds that have hollow bones for flight, penguins have evolved hard solid bones that keep them low in the water. Antarctic penguins also have unique feathers that work similarly to a waterproof diving suit. Tufts of down trap a layer of air within the feathers, preventing the water from penetrating the penguin’s skin. The pres¬sure of a deep dive releases this air, and a penguin has to rearrange the feathers through a process called “preening.” Penguins also have an amazing circulatory system, which in extremely cold waters diverts blood from the flippers and legs to the heart.

While the harsh climate of the Antarctic doesn’t threaten the survival of Antarctic penguins, overheating can be a concern, and therefore, global warming is a threat to them. Temperate species have certain physical features such as fewer feathers and less blubber to keep them cool on a hot day. African penguins have bald patches on their legs and face where excess heat can be released. The blood vessels in the penguin’s skin dilate when the body begins to overheat, and the heat rises to the surface of the body. Penguins who are built for cold winters of the Antarctic have other survival techniques for a warm day, such as moving to shaded areas or holding their fins out away from their bodies.