Life is over, only its silent voice remains,
Entrusted to the next, its breath remains;
I know not what I will be in the beyond,
Only a broken plectrum’s melody remains.

From the memories of the days now past,
From the silent whom I thought were friends,
From the words repeated at every breath,
Only its rank-struck, dry lyric remains.

Yesterdays yellowed as if fall has hit;
Sorrow rests now on faces once lit;
Past now scattered with a blown wind,
What is done is done, its lament remains.

Birds we were, chirping, “It will appear”
Flew we did, seeking a lofty ideal;
And now it is time to fly beyond there,
From this worldly lie, only a tune remains.

Translated from Turkish by Lina Cakmak

According to a recent report by the UN, factors like climate change and high demand for energy are the main reasons for switching to alternative sources, among which biogas is an essential one. The same report also indicates that increasingly higher shares of budgets are spent on biogas, solar and wind energy research.

What is Biogas?

Biogas is a mixture that is produced by microorganisms during the decomposition of vegetable and animal wastes in an oxygen-free environment. It consists of methane (60–70%), carbon dioxide (30–40%) and hydrogen-sulfide (0–2%). For its production, plant seeds that are rich in oil (e.g. sunflower), vegetables rich in carbohydrates (e.g. potato, wheat, corn, beet), fiber-rich plants (e.g. flax), other plant and tree remains (e.g. branches, hay, roots, bark), and animal remains can be utilized as raw material. Municipal and industrial waste can also be utilized on the condition that they are purified from inorganic materials like plastic and glass.

Biogas is an environmentally friendly energy source that is easy to produce almost anywhere. Biogas production capacity is directly proportional to the agricultural level of a country. Its ease of production and relatively higher efficiency compared to other renewable energy sources make it particularly important for countries which are not self-sufficient in energy production.

Biogas production in reactors

Biogas is produced by two main methods. In one case, the amount of biogas that can be extracted from the available organic waste is calculated. Then reactor tanks are designed according to the rate of production. In the other case, the energy requirement of a certain system (in terms of biogas energy) is calculated first, and then the reactors are built accordingly. The main concern in both designs is of course achieving the maximum efficiency and ease with minimum cost.

We can list the parameters in the design of a reactor tank as follows:

– Type and amount of organic material

– Type and amount of raw material

– Meeting the heat requirement of the chemical process

– Mixing various materials in appropriate proportions

Currently, reactors that are fed with raw materials on a daily basis are widely used in rural areas. This type of reactor is known as a continuous reactor. In cases where daily feeding is not possible, semi-continuous reactors are used instead. In this second type, re-feeding of the reactor is not necessary till the end of the first production cycle, but at the end of each cycle, the reactors have to be emptied and cleaned for the next cycle.

Keeping the temperature of the medium at the correct level is crucial. Solar energy can be used to manage this. It can help heat the liquid mixture up to the desired temperature and prevent the heat loss in certain designs by providing the green-house effect.

Implementing in daily use

How to implement biogas as an alternative source of energy in real life is surely an important subject. Currently, energy production from biogas is carried out either by direct burning or enriching and converting it into other forms of fuel to be used in industry.

One may wonder how good biogas really is compared to current energy sources. In terms of biogas production capacity, 440 lbs of food waste is equivalent to the daily manure production from 5 cows. From this much food waste or manure, 88 ft of biogas can be obtained. In terms of energy, this is equivalent to 9 lbs of wood, or 3 lbs of charcoal or 0.16 gallons of coal oil, 1.5 lbs of gasoline and finally 56.50 ft of natural gas. What can we really do with this much energy? Here is a small list of things we can do:

– cook 3 meals a day for a normal size family for 3 days

– run a 2-horsepower engine for an hour

– keep a 60–100 Watt lamp on for six hours, which is approximately 1.25kWh electrical energy

– heat two bedrooms daily

Humanitarian issues

Although when the western developed countries are considered, biogas is an excellent way of making use of waste food and other organic remains, it still calls for global thinking. In western countries, cutting food waste and turning it into useable energy is an advantage of biogas. Whether that energy is really needed is another issue to think about. People need to evaluate honestly how much energy they really need; they must consider the lights that are left on for no purpose, the heating and cooling systems that are over-used for extreme comfort, the excess of food they leave on plates and the pots of food dumped in the trash… Besides, in much of the rest of the world, there is malnutrition and a shortage of food. So, a straightforward question is, “Is it fair to consume edibles to make energy that we do not necessarily need, while there are people suffering from hunger?”

Biogas clearly holds promise to resolve both the energy problem and the environmental crisis of our modern days. However, will it ever be possible to find resources that can satisfy the consumption needs of a humanity that lacks virtues such as contentment and the desire to share?

Bekir Mugayitoğlu is an environmental engineer. He lives in West Virginia, USA.

The theory is simple: Cosmic particles coming from outer space continuously collide with stable carbon-12 atoms in CO2 molecules, which are widespread in the atmosphere. Each carbon-12 atom takes up two neutrons and is converted into a radioactive carbon-14 atom. Radioactive carbon-14 atoms rapidly mix and become uniform throughout the atmosphere. Deep oceans, the biosphere, and carbonate rocks are giant reservoirs of carbon and with the addition of the atmosphere they constitute the carbon cycle of the Earth. Within this cycle, radioactive carbon-14 is continuously created and disintegrated. Both processes are in equilibrium. Since the total amount of carbon on the Earth is constant, a constant ratio is established between the amount of stable and radioactive carbon. This same ratio is valid in all the reservoirs of carbon in this giant cycle. In the biosphere, both carbon-14 and carbon-12 atoms are added to the food chain via assimilation; first by plants through photosynthesis and then by animals through consumption of the plants. For an animal or a plant, a carbon-14 atom is no different from a carbon-12 atom in assimilation. Living beings continuously take up both atoms, so the ratio of both atoms in their bodies remains constant throughout their life. When an organism dies, the uptake of exogenous carbon is terminated. After this point, although the amount of carbon-12 remains constant, carbon-14 continues to disintegrate and the ratio starts to decrease after the body dies. Because the ratio after death is related to the time that has passed since death, it is possible to determine the date of death by measuring the amount of radiocarbon present.

The half-life of radiocarbon is 5,730 years. This means that after 5,730 years half of the total amount of radiocarbon in a dead body disintegrates. The remaining half decays in the following 5,730 years and only a quarter of the first amount remains. This goes on until a very minuscule, undetectable amount remains. In bodies less than 50,000 years in age the amount of radiocarbon can be detected. For an older body, the amount of radiocarbon is so small that the instruments would be unable to measure the amount of radiocarbon present. In addition, such a test obviously works only on the remains of things that were once alive, such as bones or wooden parts of an old structure.

But how accurate is an age determined by this method? How dependable is this technique for enlightening us about the past? Although the theory seems quite consistent from a general outlook, one can see it is not the case when analyzed more rigorously.

Archeologists have tried different ways to test the accuracy of the method. The results have revealed long-term and short-term variations from the actual ages. Long-term variations show systematic deviations of the radiocarbon age from the real age; that is as the date of the sample gets older the deviation increases. On the other hand, short-term variations show irregular fluctuations in the radiocarbon age from the real age. These deviations apparently reveal that the assumptions made concerning the radiocarbon technique were not accurate. The results of these important abnormal conclusions in radiocarbon dating were summarized in the Introduction to Prehistoric Archaeology as follows: “for years, it was thought that possible errors could have minor effects, however, recent research shows that the natural concentration of carbon-14 deviates at some certain periods, significantly affecting the calculated ages.”

The method is based on two assumptions that should be examined carefully: Firstly, the method assumes that the ratio of carbon-14 to carbon-12 has remained constant in the atmosphere from the time the body died to the present. However, recent scientific research has proven that this ratio has not remained constant during geological time.

Secondly, the method also assumes that the carbon supply to the organism was made only by the global carbon cycle and no other source of carbon has affected the system.

Initial concerns about the possible sources of error were focused on the constant ratio assumption. So, why did the constant ratio assumption turn out to be incorrect? Actually, many reasons were found to refute the validity of this assumption. The most important ones are explained below:

Changes in the Earth’s magnetic field are believed to be responsible for long-term deviations in radiocarbon dating. By investigating the orientation of magnetic minerals in ancient rocks, geologists have proven that the magnetic field surrounding the Earth has not been constant throughout the time. Today, it is widely accepted that both the strength and direction of the Earth’s magnetic field has changed. Interestingly, these changes are appreciable even within a century. Changes in the geomagnetism affect the radiocarbon production in the upper atmosphere; cosmic rays are deflected according to the strength of the Earth’s magnetic field. If the magnetic field is high, more cosmic rays are deflected away from the Earth and the production of radiocarbon falls. If it is low, production rises. When the production rate changes, a new equilibrium concentration in the carbon cycle as a whole can only be established after a considerable amount of time has passed. The likely time scale for achieving the complete new equilibrium level is about 10,000 years. This is about the same as the age of the sample that is to be dated! The bottom line is that anything that affects the density of cosmic rays reaching the atmosphere will affect the rate of radiocarbon production, thus affecting the ratio.

Short-term changes might be the results of different factors. One of these is the variation in sunspot activity. Sunspots appear as dark places on the surface of the Sun for a short period of time and generate strong geomagnetic storms. Sunspot activity increases the Earth’s magnetic field and leads to a decrease in the radiocarbon production rate. Therefore, again, anything that causes a change in the Earth’s magnetic field will affect this ratio.

Other effects for short-term variations are the changes in the Earth’s climate. It is widely accepted that the amount of carbon in the atmosphere during geological time is strongly related to temperature changes on the Earth. This fact is also key in understanding the global greenhouse effect, which occurs with the release of high amounts of carbon dioxide to the atmosphere by hydrocarbon combustion. The global sea level has also been affected by these climatic changes. During low temperature seasons (ice ages or glacial periods), large ice sheets covered most of the continents and as a result of this, the sea level dropped appreciably. During these periods, a high amount of carbon (as carbon-dioxide) was kept inside glaciers and they became C-14 depleted (dead carbon). By the end of the Ice Age, large amounts of dead carbon had been released into the system and they had decreased the global ratio of radiocarbon.

Actually, three more resources of dead carbon make a negative contribution to the ratio. One of them is the dead carbon that comes up from deep Earth through volcanic eruptions. Radiocarbon dating of an organism that lived in the vicinity of a volcano gives inaccurate results. Because of the expulsion of dead carbon, samples found close to volcanoes have less radiocarbon in their body than others. Consequently, the age determination of these samples gives significantly incorrect results.

As is obvious from the previous examples, the main problem arises in the lack of knowledge about the history of the sample being dated by this method. Another example is when the sample being tested is wood from the inner part of a tree; the radiocarbon method gives an incorrect result in this case. The reason for this is that the innermost part of a tree finishes the carbon cycle before the tree dies. If a sample was made from this part of the tree (it is impossible to know which part of a tree is being used) then the date produced would be greater than its real age.

Even human activity is an important resource for dead carbon. Although only effective since the last century, a high amount of dead carbon in the carbon dioxide has been released into the atmosphere by the burning of fuel. So the ratio of radiocarbon has decreased. Actually, compared to the factors above, this effect has a more profound influence on the application of radiocarbon dating: No recent organic material can be used as a modern standard. Because of this, the zero point of the timescale chosen is to be 1950 AD, as determined by the US National Bureau of Standards for quoting radiocarbon results.

Consequently, the ages determined by the radiocarbon method are not taken seriously by archeologists because of the problems in the basic assumptions upon which the method was established. Occasionally, the radiocarbon method is used to roughly determine whether an object is modern or of considerable antiquity; in essence, it is used as an authenticity test. Even then the answer may not be clear-cut; for example, an old piece of timber could have been carved to produce an authentic looking sculpture!

Radiocarbon dating is an example of how scientific tools should be used carefully to unfold the reality around us. Scientific theories are only poor models of what is happening in reality. The history of science is full of such examples, which sometimes may be misleading if not handled carefully.

Reference

Radiocarbon Dating, Sheridan Bowman, University of California Press, 1990

According to the author, Islams response to modernity has passed through three stages: revivalism, reform (including nationalism), and fundamentalism. Each has emerged from the former ones failure: the inability to achieve true independence, self-sustaining economic and scientific infrastructures, and a realistic alternative to a now-globalized system that marginalizes and ignores the Muslim world.

Lawrence builds his book around several arguments. First, Islam and being Muslim are not synonymous with being Middle Eastern Arabs, who are a minority within the fold of Islam. Second, the Islamic world is not a unified bloc, as shown by failures at attempts to unify individual countries or even to agree on what constitutes real Islam. Thus there is no basis for the Wests fear of a so-called clash of civilizations. Lawrence maintains that the likelihood of this happening is as remote as Canada, the United States, and Mexico uniting because they profess Christianity.

Third, fundamentalism has surged since the 1970s because of the failure of Arab nationalism, the use of oil money to create dependent rentier states, and the success of the Iranian revolution (1979). Other reasons include an omnipresent nation-state structure that blocks all outlets of legitimate protest, as well as the practices of every party trying to justify itself in terms of Islam because that is the most effective rallying cry.

Fourth, fundamentalists are mainly educated urban or newly urbanized young men who have little hope of finding a job after graduation, instead of the stereotypical types often presented in the media. Frustrated and angry, yes; but far from being uneducated, illiterate, and easily swayed by demagogues. What attracts them to fundamentalism is its black-and-white nature and its promises of a better and more just future. Unfortunately, fundamentalism preaches idealism and utopia, is destructive instead of constructive, and offers no viable alternative (Iran being the sole exception).

Throughout this book, Lawrence maintains that Iran is worth watching, for it is the social laboratory in which Islam is grappling with modernity on a daily basis. Another Muslim country worth watching is Malaysia, which has moved jihad from the battlefield to the economic and development plane by striving to become a fully modern industrialized nation by 2020. It appears to be the first Muslim country actively trying to disprove the assertion that Islam precludes such a transformation.

The author also discusses the role of women, a favorite media topic. Basing himself on several geographically distinct Muslim countries, he concludes that attempts to restrict women to the home, while often justified in Islamic terms by a patriarchal sociopolitical order, reflect the fact that there are not enough jobs to go around even for men. As long as the army remains one of the few ways of social and economic advancement, economies do not develop and expand, modern technical education remains beyond reach for most young people, and skilled foreign workers are hired because there are not enough trained local workers, this problem will persist.

Lawrence has done the reading public a great service by reaching beyond stereotypes and lazy scholarship to give us a much more realistic view of the Muslim world and its inhabitants.