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Introduction
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Deforestation is a complex problem with no single cause or solution. While most of us believe that deforestation is a recent occurrence that gained momentum in the 1950s, its history stretches back some half-a-million years and can be traced to the beginning of civilization. British historian, Clive Ponting, pointed out that the problem is thousands of years old and abuse of natural resources has caused many previous civilizations to collapse.
 

Historically, wood has been the most dominant form of heating, fuel, building houses, making a multitude of implements ETC. The nuts & fruits of the trees are useful for human food, medicines and dyes. As population expanded and settlements grew, more and more trees were cut down to provide clearings for agriculture, fire for heating and cooking, and construction materials for homes and household goods. As a result, a series of ecological breakdowns occurred as animals overgrazed, topsoil eroded and flooding became common that affected even the most formidable civilizations. In 650 BC the Greece hillsides once covered with vegetation became barren, seriously affecting the Greek economy and political power. Greek philosopher Plato (427 – 347 BC) compared hills and mountains of Greece to the bones of a wasted body stating, "All the richer and softer parts have fallen away and the mere skeleton of the land remains." In the fourth & fifth century serious deforestation and abuse of other natural resources, in addition to the political decay, greatly contributed to the fall of the Roman Empire. The Roman generals would simply burn the massive forestlands to the ground whenever Gauls or Britains would escape into them. The history of Easter Island, its statues and its peoples, has long been shrouded in mystery. New evidence based on pollen analysis suggests that the Easter Island inhabitants destroyed their own society through deforestation.

 

After the first European contact with the New World over 500 years ago, the forests of the Western Hemisphere began to disappear. The more accessible forests of Brazil and the Caribbean were converted into sugar plantations. In North America, settlers arrived from Europe and slaves were brought in from Africa to convert what was once a vast expanse of temperate forest into farms and ranches to accommodate the settlers' growing needs for cooking, heating, constructing houses and furniture. Meanwhile, back in Europe, the arrival of the Industrial Revolution put tremendous pressure on the remaining forests to supply fuel for the smelters and foundries of the new industries. Before the end of the 19th century, most of the Europe's ancient forests were only distant memories.

 

All that has changed since the mid-twentieth century is that this ancient process of catastrophic cutting of trees has accelerated at an alarming rate and is beginning to cause severe, irreversible damage to the environment today.

 

But what exactly is a forest, why is it so important and what constitutes ‘deforestation’?



Forests

A forest is not just about trees. It is a complex ecosystem with distinct, myriad interrelationships of living parts - plants, animals and micro-organisms - to each other and to other non-living parts – soil, climate, water, organic debris.  The trees are the major components that create a special environment that allow the kinds of animals and plants that can exist in the forest. The FAO (Food and Agriculture Organization) has defined forest as land with tree crown cover of more than 10% and area of more than 0.5 hectare.
 

Some legal definitions of ‘forest’ are based on the actual vegetation on the ground, whereas other definitions are based on a defined land area, which may have no vegetation on it at all but is legally under the jurisdiction of the national agency, which manages forests and natural resources. For instance, India’s Forest Conservation Act of 1980 states that any land recorded as forest in any land record is legally forestland whether or not there is any vegetation on the land. The Philippines has a definition based on the slope of the land - any untitled land having a slope greater than 18% is considered to be forestland.

 

Forests are subdivided into natural forests, composed mainly of indigenous trees not deliberately planted, and plantations, forests established by planting or seeding, or both, in the process of afforestation or reforestation. Natural forest’ (or forest which has not been affected by any human activity) only applies to a very few, very small remnants of forested land. The official definition of natural forest used in Denmark provides a good, broad explanation of the term. "Natural forest originates from the original forest cover, i.e. a forest reproduced naturally.
 

Natural forest is thus a forest which has spontaneously generated itself on the location and which consists of naturally immigrant tree species. Natural forests can be more or less influenced by culture, e.g. by logging or regeneration techniques, but the forests must not have been subject to regeneration by sowing or planting".

Forests are classified in terms of the ‘biome’ or the climatic region of the earth in which they occur and are accordingly known as Boreal, Tropical or Temperate forests.

  • Boreal forests, or taiga, represent the largest terrestrial biome. These can be found in areas with shorter, warm summers and long winters; there are boreal forests in Europe, Asia, Siberia, and North America. Because of the cold climates, plant life in the boreal forest is sturdy, consisting mainly of evergreens and other resilient vegetation.
  • Tropical forests occur near the equator and are the most ecologically rich of all forest types. They are also one of the most threatened forest types due to logging and clearance for agriculture.
  • Temperate forests occur in eastern North America, northeastern Asia, and western and central Europe. Well-defined seasons with a distinct winter characterize this forest biome.

Importance of Forests

Forests must be given credit for what they bring to global ecosystems and the quality of life that all species maintain. They give life, not only to other species, but they also help to prolong the human race. Tropical rainforests are incredibly rich ecosystems that play a fundamental role in the basic functioning of the planet. Rainforests are home to probably 50 percent of the world's species, making them an extensive library of biological and genetic resources. In addition, rainforests help maintain the climate by regulating atmospheric gases and stabilizing rainfall, protect against desertification, and provide numerous other ecological functions. On a daily basis, forests touch and affect our lives from breakfast, newspaper, light, traveling, to our shopping list and even blowing our noses into a tissue!

 

Forests are:

  • Natural home to biodiversity. Although covering only 6% of the Earth’s surface, these lush green, often tropical masses contain around 50% of plant and animal species on this planet. It provides 3 of the key ingredients to a species' survival: water, food, and shelter.
  • Carbon guzzlers and purify the air we breathe. They form an effective sink for the carbon dioxide produced as a result of animal respiration, burning of fossil fuels, volcanoes and other natural and human-induced phenomenon.
  • Livelihood for some 1.6 billion people worldwide, with 60 million indigenous people depending on forests for their subsistence.
  • Vital as a watershed. Because of the thick humus layer, loose soil, and soil-retaining powers of the trees' long roots, forests are vitally important for preserving adequate water supplies. Almost all water ultimately feeds from forest rivers and lakes and from forest-derived water tables.

Deforestation

Deforestation is defined as the conversion of forested land to non-forested land as a direct result of human activities. It is the non-temporary change of land use from forest to other land use or to the depletion of forest crown cover to less than 10 percent. The removal or destruction of significant areas of forest cover has resulted in a degraded environment with reduced biodiversity and in some cases even reshaping their climate and geography.
 

Global deforestation has accelerated dramatically in recent decades. The tropical forests of South America and Southeast Asia are being cut and burned at an alarming rate for agricultural uses - from huge palm oil plantations to slash and burn subsistence farming. One fifth of the world's tropical rainforest was destroyed between 1960 and 1990. Estimates of deforestation of tropical forest for the 1990s range from about 55,630 to 120,000 square kilometres each year. At this rate, all tropical forests may be gone by the year 2090!

 

Statistics on Global Rates of Rainforest Destruction:

  • 2.4 acres (1 hectare) per second: equivalent to two U.S. football fields
  • 149 acres (60 hectares) per minute
  • 214,000 acres (86,000 hectares) per day: an area larger than New York City
  • 78 million acres (31 million hectares) per year: an area larger than Poland
  • On average, 137 species become extinct everyday; or 50,000 each year!

Causes

There are both direct and indirect causes of forest loss. While some are a result of human activity, some are caused by natural phenomenon.

 

Natural causes

  • Windstorms -  In 1987, a severe windstorm in the United Kingdom destroyed some 160 km² of forest and woodland. In 1999, another storm destroyed some 5,000 km² of forests in France.
  • Diseases - During the 20th century, chestnut blight killed nearly all wild chestnuts in US forests. In the United Kingdom, Dutch Elm disease has transformed the landscape.
  • Natural fires – caused by lightning and dry conditions

Human-related direct causes

  • Clearing forest land for agricultural uses either for subsistence or for larger scale settling and planting.
  • Conversion of forest land due to infrastructure development such as road-building, hydroelectric dam construction, and mining.
  • Harvesting forests for timber - Harvesting is an important factor in the global loss of forest cover and it often results in forest degradation.
  • Harvesting forests for pulp and paper production.
  • Cutting of trees for fuel-wood and charcoal, as they are still the main source of energy for most people in developing countries.
  • Acid rain and atmospheric pollutants that degrade forest vegetation.
  • Loss of forests to fire due to deliberate or accidental human activities.
  • Destruction of forests in the course of warfare as in the case of Vietnam War or the conflicts in Myanmar (Burma) and Sri Lanka

Indirect Factors

  • Population pressure causing higher demand for agriculture, livestock production and fuel wood.
  • Poverty.
  • Relationship between land tenure systems and forest clearance - The law and land ownership systems in some countries makes it easy to take over ‘unutilized’ forest land.

  • Perverse incentives of some economic policies – such as under pricing of forest resources and government subsidies to expand agriculture and establish plantations of cash crops. Agricultural development schemes in Mexico, Brazil and Indonesia moved large populations into the rainforest zone, further increasing deforestation rates.
  • Poor governance and flouted forest conservation policies
Not all deforestation is preventable, and not all deforestation is naturally occurring. There are some instances in the Earth’s history where natural processes have changed forests to deserts and oceans to plains. However, today, millions of acres of forest are destroyed by humans for commercial exploitation.

Problems

Figures released by the FAO in Nov ’05 put the rate of natural forest loss at about 13 million hectares each year. That’s equivalent to 25 hectares every minute or 36 football fields a minute. The warning signs are all over - water tables are falling, land once buffered by woodland is more prone to drought, landslides and flash floods are destroying roads, bridges and crops, particularly as severe weather conditions grow in intensity as a result of climate change.

 

Environmental

  • Extinctions of plants, insects, animals, indigenous peoples, etc. 
  • Soil erosion occurs when trees and plants are removed; the rain water washes the nutrients in the top soil away. 
  • Desertification (dry, hot, arid conditions).
  • Climate change (more carbon dioxide is released into the atmosphere, thus increasing the effects of global warming).
  • Pollution (ground, water and air pollution from oil extraction and mining chemicals).

Social impacts

  • Loss of culture and homeland for indigenous people.
  • Displacement of people (loss of farmland, forest resources, etc).
  • Social conflicts and struggles over land and natural resources.
  • Conflicts over racial and ethnic rights.
  • Poisoning from oil and mining waste.

Deforestation Today

The largest cause as of 2006 is slash-and-burn activity in tropical forests. The method, used by native populations of over 200 million people worldwide, creates short term yields from marginal soils. With repeated practice and no intervening fallow periods, the nutrient poor soils get exhausted or eroded to an unproductive state.

 

Market-driven forestry practices are one of the leading cause of forest degradation.

 

Growing global demand for wood in construction, paper and furniture - as well as clearing land for commercial and industrial development coupled with the growing local populations and their demands for agricultural expansion and wood fuel are now endangering ever larger forest areas.

Madagascar

 

Massive deforestation has resulted in desertification, water resource degradation and soil loss, affecting approximately 94% of Madagascar's previously biologically productive lands. Most of this loss is the result of local people trying merely to subsist.

 

Nigeria

 

According to the FAO, Nigeria has the world's highest deforestation rate of primary forests and has lost more than half of its primary forest in the last five years due to logging, subsistence agriculture, and collection of fuelwood

 

Brazil

 

The rate of deforestation is largely driven by commodity prices. With the development of the new variety of soybean, farms of other crops have been displaced pushing them farther into the forest. Certain areas such as the Atlantic Rainforest have been diminished to less than 10% of their original size and the Amazon Rainforest is awaiting the same fate at 600 fires daily.

 

Indonesia

 

Large areas of forest are being lost as native forest is cleared by multi-national pulp companies. In Sumatra millions of hectares of forest have been cleared because of the need to pay off international debt obligations and to develop economically

Controlling Deforestation

The problem of deforestation is to stop cutting down the trees. But is this the only answer? Global trade in tropical timber is now worth in excess of £5 billion per year and its abolition would certainly be met with a degree of resistance, if not hostility! Among the organizations seeking to minimize the impact of commercial logging is the Forest Stewardship Council (FSC), a non-profit organization founded in 1993 that provides an independent certification of timber from well-managed forests. With an internationally recognized, the FSC enables responsible consumers to identify those timber products, which have originated from sustainable sources. On a global scale, more than 8 million hectares of forest have been certified to the FSC's exacting standards.

 

Efforts in reforestation involving participation of citizens have been initiated in many parts of the world. For instance China celebrates the Planting Day every year on March 12, USA celebrates the annual Arbour Day in April.

References

http://archives.econ.utah.edu/archives/pen-l/2001m06.4/msg00081.htm
http://www.costaricaforest.org/news/articles/002.htm
http://www.runet.edu/~wkovarik/envhist/1ancient.html
http://www.mentalfloss.com/blogs/archives/1851
http://en.wikipedia.org/wiki/Deforestation
http://www.sowashco.k12.mn.us/ojh/depts/soc/kane/deforestation.htm
http://www.mongabay.com/09easter_island.htm
http://www.globalchange.umich.edu/globalchange2/current/lectures/deforest/deforest.html
http://jrscience.wcp.muohio.edu/nsfall00/ProposalArticles/DeforestationsaffectonCli.html
http://www.edugreen.teri.res.in/explore/forestry/what.htm
http://www.umich.edu/~gs265/society/deforestation.htm
http://panda.org/about_wwf/what_we_do/forests/about_forests/importance/index.cfm
http://www.forestfacts.org/l_3/forests_1.htm
http://rainforests.mongabay.com/0801.htm

http://www.infoplease.com/ce6/sci/A0858185.html
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