Read the following text and answer question.

Introduction to Climate change

Many people make Climate Change and Global Warming a scary and difficult thing to understand, _______ it’s not.

Scientists have warned that the world's climate has changed a lot, and has affected many living and non-living things. Many places _______ were warmer are now getting colder, and many colder regions are getting much colder or even warmer nown as Global Warming).

For example, _________ 1901 and 2012, it is believed that the earth's temperature has risen by 0.89 °C. Rainfall amounts have also risen in the mid-latitudes of the northern hemisphere since the beginning of the 20th Century. It is also believed that sea levels have risen up to about 19cm globally, with lots of glaciers melting in addition.

Some people do not believe that these are caused by human activities. They think it is all political actions and falsehood intended to cause panic among humans.

Well, whatever it is, we would like to know more, and take a few good points from this confusion, and use them to make our world a better place to live. 

(Adapted from: https://goo.gl/xQnjzZ. Access: 01/22/2018)

A Brief and Simplified Description of Papermaking

The paper we use today is created from individual wood fibers that are first suspended in water and then pressed and dried into sheets. The process of converting the wood to a suspension of wood fibers in water is known as pulp making, while the manufacture of the dried and pressed sheets of paper is formally termed papermaking. The process of making paper has undergone a steady evolution, and larger and more sophisticated equipment and better technology continue to improve it.

The Wood yard and Wood rooms

The process at Androscogging began with receiving wood in the form of chips or of logs 4 or 8 feet in length. From 6 AM to 10 PM a steady stream of trucks and railroad cars were weighted and unloaded. About 40 percent were suplied by independents who were paid by weight their logs. The mill also received wood chips from lumber mills in the area. The chips and logs were stored in mammoth piles with separate piles for wood of different species (such as pine, spruce, hemlock).

When needed, logs were floated in flumes......(1).....the wood yard.....(2).....one of the mill’s three wood rooms. There, bark was rubbed......(3)........in long, ribbed debarking drums by tumbling the logs against one another. The logs then fell into a chipper;......(4)......seconds a large log was reduced to a pile of chips approximately 1 inch by 1 inch by 1/4 inch.

The chips were stored in silos. There were separate silos for softwoods (spruce, fir, hemlock, and pine) and hardwoods (maple, oak, beech, and birch). This separate and temporary storage of chips permitted the controlled mixing of chips into the precise recipe for the grade of paper being produced.

The wood chips were then sorted through large, flat vibrating screens. Oversized chips were rechipped, and ones that were too small were collected for burning in the power house. (The mill provided approximately 20 percent of all its own steam and electricity needs from burning waste. An additional 50 percent of total electricity needs was produced by harnessing the river for hydroelectric power.)

Once drawn from the silo into the digesters, there was no stopping the flow of chips into paper. 

Pulpmaking

The pulp made at Androscoggin was of two types: Kraft pulp (produced chemically) and ground wood pulp (produced mechanically). Kraft pulp was far more important to the high quality white papers produced at Androscoggin, accounting for 80 percent of all the pulp used. Kraft pulp makes strong paper. (Kraft is German for strength. A German invented the Kraft pulp process in 1884.) A paper’s strength generally comes from the overlap and binding of long fibers of softwood; only chemically was it initially possible to separate long wood fibers for suspension in water. Hardwood fibers are generally smaller and thinner and help smooth the paper and make it less porous.

The ground wood pulping process was simpler and less expensive than the Kraft process. It took high quality spruce and fir logs and pressed them continuously against a revolving stone that broke apart the wood’s fibers. The fibers, however, were smaller than those produced by the Kraft process and, although used to make newsprint, were useful at Androscoggin in providing “fill” for the coated publication gloss papers of machines 2 and 3, as will be described later.

^(A)The chemical Kraft process worked by dissolving the lignin that bonds wood fibers together. ^(B) It did this in a tall pressure cooker, called a digester, by “cooking” the chips in a solution of caustic soda (NaOH) and sodium sulfide (Na²S), which was termed the “white liquor.” ^(C)The two digesters at Androscoggin were continuous digesters; chips and liquor went into the top, were cooked together as they slowly settled down to the bottom, and were drawn off the bottom after about three hours. ^(D) By this time, the white liquor had changed chemically to “black liquor’’; the digested chips were then separated from this black liquor. ^(E)

In what was known as the “cold blow” process, the hot, pressurized chips were gradually cooled and depressurized. A “cold liquor’’ (170°F) was introduced to the bottom of the digester and served both to cool and to transport the digested chips to a diffusion washer that washed and depressurized the chips. Because so much of the lignin bonding the fibers together had been removed, the wood fiber in the chips literally fell apart at this stage.

The black liquor from the digester entered a separate four-step recovery process. Over 95 percent of the black liquor could be reconstituted as white liquor, thereby saving on chemical costs and significantly lowering pollution. The four-step process involved (1) washing the black liquor from the cooked fiber to produce weak black liquor, (2) evaporating the weak black liquor to a thicker consistency, (3) combustion of this heavy black liquor with sodium sulfate (Na₂SO₄ ), and redissolving the smelt, yielding a “green liquor” (sodium carbonate + sodium sulfide), and (4) adding lime, which reacted with the green liquor to produce white liquor. The last step was known as causticization.

Meanwhile, the wood-fiber pulp was purged of impurities like bark and dirt by mechanical screening and by spinning the mixture in centrifugal cleaners. The pulp was then concentrated by removing water from it so that it could be stored and bleached more economically.

By this time, depending on the type of pulp being made, it had been between 3 1/2 and 5 hours since the chips had entered the pulp mill. 

All the Kraft pulp was then bleached. Bleaching took between 5 and 6 hours. It consisted of a three-step process in which (1) a mix of chlorine (Cl₂ ) and chlorine dioxide (CIO₂ ) was introduced to the pulp and the pulp was washed; (2) a patented mix of sodium hydroxide (NaOH), liquid oxygen, and hydrogen peroxide (H₂ O₂ ) was then added to the pulp and the pulp was again washed; and (3) chlorine dioxide (ClO₂ ) was introduced and the pulp washed a final time. The result was like fluffy cream of wheat. By this time the pulp was nearly ready to be made into paper.

From the bleachery, the stock of pulp was held for a short time in storage (a maximum of 16 hours) and then proceeded through a series of blending operations that permitted a string of additives (for example, filler clay, resins, brighteners, alum, dyes) to be mixed into the pulp according to the recipe for the paper grade being produced. Here, too, “broke” (paper wastes from the mill itself) was recycled into the pulp. The pulp was then once again cleaned and blended into an even consistency before moving to the papermaking machine itself.

It made a difference whether the broke was of coated or uncoated paper, and whether it was white or colored. White, uncoated paper could be recycled immediately. Colored, uncoated paper had to be rebleached. Coated papers, because of the clays in them, could not be reclaimed.

How to beat loneliness

Loneliness is a subjective feeling. You may be surrounded by other people, friends, family, workmates — yet still feel emotionally or socially disconnected from those around you. Other people are not guaranteed to shield us against the raw emotional pain that loneliness inflicts.

But raw emotional pain is only the beginning of the damage loneliness can cause. It has a huge impact on our physical health as well. Loneliness activates our physical and psychological stress responses and suppresses the function of our immune systems. This puts us at increased risk for developing all kinds of illness and diseases, including cardiovascular disease. Shockingly, the longterm risk chronic loneliness poses to our health and longevity is so severe, it actually increases risk of an early death by 26%.

There are many paths to loneliness. Some enter loneliness gradually. A friend moves away, another has a child, a third works a seventy-hour work week, and before we know it our social circle, the one we had relied upon for years, ceases to exist. Others enter loneliness more suddenly, when they leave for college or the military, lose a partner to death or divorce, start a new job, or move to a new town or country. And for some, chronic illness, disability or other limiting conditions have made loneliness a lifelong companion.

Unfortunately, emerging from loneliness is far more challenging than we realize, as the psychological wounds it inflicts create a trap from which it is difficult to break free. Loneliness distorts our perceptions, making us believe the people around us care much less than they actually do, and it makes us view our existing relationships more negatively, such that we see them as less meaningful and important than we would if we were not lonely.

These distorted perceptions have a huge ripple effect, creating self-fulfilling prophecies that ensnare many. Feeling emotionally raw and convinced of our own undesirability and of the diminished caring of others, we hesitate to reach out even as we are likely to respond to overtures from others with hesitance, resentment, skepticism or desperation, effectively pushing away the very people who could alleviate our condition.

As a result, many lonely people withdraw and isolate themselves to avoid risking further rejection or disappointment. And when they do venture into the world, their hesitance and doubts are likely to create the very reaction they fear. They will force themselves to attend a party but feel so convinced others won’t talk to them, they spend the entire evening parked by the hummus and vegetable dip with a scowl on their face, and indeed, no one dares approach — which for them only verifies their fundamental undesirability. […] 

(Source: Guy Winch, at TED Ideas. Retrieved at: http://ideas.ted.com/how-tobeat-loneliness/) 

Available at:< https://www.nytimes.com/2018/08/10/magazine/a-diagnosis-update-a-young-womans-extreme-muscle-pain-persists.html>. Acess on: Aug. 10, 2018