The tropical rainforests are falling at human hands. The world’s oldest living ecosystem is under threat in our conquest for farmland, timber, minerals, and other resources (Grainger 17). These forests cover 2% of the Earth’s surface, or 6% of its landmass, yet they house over half the plant and animal species on Earth (“Rainforests”). Rainforests originally covered twice that area. Deforestation is occurring on such a scale that if it were to continue “at present rates the forests could disappear within the next one to two hundred years” (Grainger 17).
Why should we be concerned? Deforestation poses a threat to the rich biological diversity of tropical rainforests, hinders the advancement of medicinal discoveries, and contributes largely to the greenhouse effect. Because if the forests go, then so will many of the species that they support. This greatly reduces the biological diversity of the whole planet. Secondly, deforestation curtails “our future options to exploit other plants for medicines,” (Grainger 17). Finally, it will contribute to the impending global climate change through the greenhouse effect (Grainger 18). For these reasons it is imperative to control deforestation so that a large area of tropical rainforest will remain.
Tropical rainforests are defined by two primary factors: location (in the tropics) and amount of rainfall they receive (“Rainforests”). Rainforests receive from 4 to 8 meters of rain a year (“Rainforests”). Most of the rainfall is blocked by the heavy vegetation, and water reaches the forest floor by rolling down branches and trunks. Another distinctive characteristic is that the rainforests have no “seasonality”—no dry or cold season of slower growth (“Rainforests”). In addition, they are the Earth’s oldest living ecosystems. The Rainforests are a “priceless part of our natural heritage” and their removal through deforestation would mean the loss of one of the planet’s most valuable ecosystems (Grainger 146).
Rainforests are being destroyed at an astounding rate. According to the National Academy of Science, at least 50 million acres a year are lost, “an area the size of England, Wales, and Scotland combined,” (“Rainforests”). “All the primary rainforests in India, Bangladesh, Sri Lanka and Haiti have been destroyed already” (“Rainforests”). In addition, the rainforests of the Ivory Coast have almost been completely logged. Areas such as the Philippines and Thailand lost over 50% of their rainforests by 1985 (“Rainforests”). These statistics prove that there is no more powerful reason for wanting to preserve the tropical rainforests.
Biological diversity, often shortened to “biodiversity,” has three main components: ecosystem diversity, species diversity, and genetic diversity. So the biodiversity of a given area is characterized by the presence of different kinds of ecosystems; its species diversity; and its contribution to the genetic diversity of particular species (Grainger 147). According to the National Academy of Sciences, a typical four square mile patch of rainforest contains as many as 1500 species of flowering plants, 750 species of trees, 125 mammal species, 400 species of birds, 100 of reptiles, 60 of amphibians, and 150 species of butterflies (“Rainforests”). In particular, deforestation threatens to reduce these numbers of species, degrade the genetic diversity of individual species, and hinder the survival rate of species already exploited in their wild form in the forests.
Major consequences arise for plant and animal species as a result of deforestation. All forms of disturbance displace animals from part or all of their territories. The more extensive the disturbance, the more likely animals in an area will become overcrowded and their populations will decline due to social pressures, limitations on food, and impaired reproductive activity (Grainger 150). Even by just removing a few plants, the complex annual calendars of food sources could be disrupted. These annual food source schedules enable many rainforest animals, like the orangutan, to cope with the “low density and irregular flowering and fruiting regimes of the plants they eat” (Grainger 150). Moreover, other plants may be affected “if animals on which they rely for pollination or dispersal leave to search for food elsewhere” (150).
Furthermore, genetic diversity of individual species is also being degraded. This is a concern to plant breeders because several of these species are commercially valuable crops (Grainger 147). Their degradation will “threaten our ability to continue breeding new varieties to keep ahead of pests and diseases that threaten products.” Several key economic crops that originate in the humid tropics and still grow there today are brazil nut, cashew nut, cocoa, passion fruit, pineapple, rubber, papaya, bamboo, banana, ginger, rice and yam (Grainger 152). Crops that grow on the outskirts of the forests have been bred from wild plants to give the best yields under particular environmental conditions. Extracts from the wild plants have been taken in order to make use of specific genetic characteristics from the entire population. “It is vital to retain a wide genetic diversity of wild plants so that plant breeders can counter threats to crop productivity caused by new pests and diseases and changing climate.” For example, in the Amazon huge sums of money are spent in breeding new groundnut varieties resistant to diseases such as leafspot (Caufield). Also, some high yielding rice varieties last only two years before being attacked by a new insect pest and needing replacement (Grainger 152).
Deforestation is increasing the rate of species extinction so that the plants we are using will disappear along with many animals also. “Extinction is an irreversible change and once a species is gone it is lost for good” (Grainger 150). It occurs naturally at a rate of about one species every two years (150). Species are put at much risk early on when their numbers drop so low that they could be eliminated by drought, disease or other random events. There are many endangered species found in the tropical rainforests that risk extinction if the present conditions continue. Some examples are the koupray or wild cow of Southeast Asia, of which only 100 individuals remain, the broad-nosed lemur from Madagascar, which is down to just two colonies, and the southern bearded saki, a monkey living in the forests of the northeast Amazonia (150).
Many medical advances have come from the abundant botanical resources of the tropical rainforests. Half of the Earth’s plant species live there and only 1% have been thoroughly examined for medicinal potentials (“Rainforests”). Extracts from organisms are used directly as drugs for many maladies ranging from headaches to lethal diseases such as malaria. An aid in the cure of malaria, quinine, is an alkaloid extracted from the bark of the cinchona tree found in Latin America and Africa (“Rainforests”). Also, the alkaloid d-turbocuarine found in the “deadly poisonous bark of curare lianas is used to treat diseases such as multiple sclerosis, Parkinson’s disease, and other muscular disorders.” Lastly, two important anti-tumor agents are found in periwinkle from Madagascar. “One provides for a 99% chance of remission in cases of lymphatic leukemia. The other offers a life remission in 58% of Hodgkin’s Disease sufferers.”
In addition, chemical structures from organisms serve as templates for which scientists can chemically synthesize drug compounds. Approximately 7,000 medical compounds prescribed by Western doctors are derived from plants that reside in the rainforests (“Rainforests”). The blueprint for aspirin is found in extracts from willow trees in the rainforest for example. And ninety percent of prescription drugs that are based on higher plants from the rainforest include direct extractions from those plants (“Rainforests”).
Finally, the plants of the rainforest provide aids for research. Some plants provide testing agents for potentially harmful food or drug products while other plant compounds allow scientists to understand how cancer cells grow (“Rainforests”). Also, tropical forests “offer hope to safer contraceptives.” “Approximately 4,000 plant species have been shown to offer contraceptive possibilities.” This is a notable fact since the exponential growth of the world’s population is in need of more effective birth control methods.
Deforestation also contributes significantly to the greenhouse effect and global warming. The greenhouse effect describes how Earth’s atmosphere functions. To begin, the sun emits short wave radiation through the atmosphere to the Earth. In return, the Earth radiates some of the sun’s energy back into the atmosphere in the form of long-wave infrared radiation. Certain trace gases such as carbon dioxide, methane, ozone, and nitrous oxide retain heat by trapping some of the infrared radiation. Without these “greenhouse gases” the Earth would be 33C cooler than it is now (“Rainforests”). Clearing and burning rainforests releases considerable amounts of greenhouse gases into the atmosphere. “Each year, deforestation contributes 23-30 percent of all carbon dioxide in the atmosphere” (“Rainforests”). Deforestation is also responsible for destroying our means of absorbing and storing the substance. This leads to global warming because the Earth has lost one of its only ways to absorb excess atmospheric carbon. Through photosynthesis the rainforests absorb the carbon dioxide and emit oxygen. Yet, with deforestation there is “more and more carbon released into the atmosphere” due to the burning of the plants, and “less and less forests to remove the carbon from the atmosphere” (“Rainforests”).
Rapid warming of the atmosphere can have tremendous consequences. First, many species will not be able to survive the climate change or may not be able to continue life in another habitat. Secondly, the sea level will rise approximately 1.5 meters which will cause coastal flooding (“Rainforests”). Also, an impact can occur on agriculture in food exporting nations such as the United States, Canada and France as a result of drought and drier soil conditions (“Rainforests”). And lastly, there will be increases in severe storms such as hurricanes, cyclones, and typhoons (“Rainforests”).
Tropical deforestation has many significant environmental impacts. It threatens the biodiversity of our planet, deters medicinal discoveries plant species may offer and contributes to potential global warming resulting from the greenhouse effect. In conclusion, conservation of the tropical rainforests is imperative in order to preserve one of the Earth’s oldest, most rich and valuable ecosystems.
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Table of Contents
Important Facts 1
Historical Background 1-2
Background Law 2
Causes of Deforestation 2
The Green House Effect 2-3
Reducing Deforestation 3
Case Studies 3-4
Pros and Cons 4-5
Ninety percent of our trees, 300 - 900 years old, have been cut down.
The remaining 10% is all we will ever have. Deforestation is a significant issue
of our time and must be taken seriously if we want to protect our remaining
forests. The definition of deforestation by the Random House Dictionary of the
English Language is "to divest or clear of forests or trees" and we must stop
deforestation to save our planet. My intent on writing this essay is to
enlighten the reader about the facts on deforestation and to express my opinions
There are approximately 3 400 million hectares of forests in the world,
nearly 25% of the world's land area. Close to 58% of the forests are found in
the temperate/boreal regions and 42% in the tropics. For about a millennium,
people have benefited from the forests. Forest products range from simple
fuelwood and building poles to sophisticated natural medicines, and from high-
tech wood based manufactures to paper products. Environmental benefits include
water flow control, soil conservation, and atmospheric influences. Brazil's
Amozonia contains half of the world's tropical rain forests. The forests cover a
region 10 times the size of Texas. Only about 10% of Brazil's rain forests have
been cut to date, but cutting goes on at an uncontrollable rate.
Since pre-agricultural times the world's forests have declined one fifth
from 4 to 3 billion hectares. Temperate forests have lost 35% of their area,
subtropical woody savannas and deciduous forests have lost 25% and ever-green
forests which are now under the most pressure have lost the least area, 6%,
because they were inaccessible and sparsely populated. Now with new technology,
such as satellites systems, low altitude photography and side looking radar,
scientists can now figure that the world is losing about 20.4 million hectares
of tropical forests annually and if these figures are not reduced, we will lose
all of our tropical forests in about 50 years. It has been suggested that the
high deforestation rates are caused partly by the fact that the new surveys are
more accurate and thus reveal old deforestation rates that have not been
detected with older methods.
At first there was concern only among foresters about deforestation but
now the public has created organizations such as Green Peace to help increase
awareness and reduce deforestation. The Food and Agriculture Organization or
F.A.O, has worked mainly within the forest community to find new and better ways
to manage the forests. Also, in 1985 there was the introduction of the Tropical
Forestry Action Plan or T.F.A.P. This plan involved the F.A.O, United Nations
development programs, the World Bank, other development agencies, several
tropical country governments, and several government organizations. Together
they developed a new strategy. More than 60 countries have decided to prepare
national forestry action plans to manage their forests.
Tropical deforestation has various direct causes: The permanent
conversion of forests to agricultural land, logging, demand for fuelwood, forest
fires and drought. Slash and burn clearing is the single greatest cause of
tropical rain forest destruction world wide. Air pollution is also a major
threat to the forests in the northern hemisphere and is expected to increase.
Reduced growth, defoliation and eventual death occur in most affected forests.
From 1850 to 1980 the greatest forest losses occurred in North America and the
Middle East (-60%), South Asia (-43%) and China (-39%). The highest rates of
deforestation per year are now in South America (1.3%) and Asia (0.9%).
Over the last two decades the world became interested in the loss of
tropical forests as a result of expanding agriculture, ranching and grazing,
fuelwood collection and timber exportation. The consequences are increased soil
erosion, irregular stream flow, climate change and loss of biodiversity.
Deforestation is second only to the burning of fossil fuels as a human source of
atmospheric carbon dioxide. Almost all carbon releases from deforestation
originate in the tropics. Global estimates of the amount of carbon given off
annually by deforestation is 2.8 billion metric tons. Deforestation accounts for
about 33% of the annual emissions of carbon dioxide by humans. In 1987 11
countries were responsible for about 82% of this net carbon release: Brazil,
Indonesia, Colombia, Cote d'Ivoire, Thailand, Laos, Nigeria, Vietnam,
Philippines, Myanmar and India. During 1987 when there was intense land clearing
by fire in Brazil's Amazon, more than 1.2 million metric tons of carbon are
believed to have been released.
To save our remaining forests we have to learn three important
principles: Reduce, reuse, recycle, i.e., lower the consumption of paper and
paper products. Some examples are getting off junk mail lists, writing or
photocopying on both sides of the paper, using cloth shopping bags, cloth
instead of paper napkins and paper towels, cloth diapers, recycling waste papers,
and buying recycled paper products. Another important fact to reduce
deforestation is that we should communicate our views to our elected
representatives and build a movement toward forest protection. Finally we should
visit forests and learn to appreciate them as places of inspiration and
The following two examples of case studies represent deforestation in
the U.S. and in Canada. It used to be that Northern California's Pacific Lumber
Company was a timber operation that was an example of good forestry. The family
run firm harvested selectively from it's 195 000 acres of Redwoods. Besides
looking after the forest, Pacific Lumber looked after it's employees, many lived
in the company town of Scotia, the company paid their kid's college tuition, the
company's controlled logging virtually guaranteed that the trees would last well
into the next century. All that changed in 1985 when Charles Hurwitz of the New
York based MAXXAM group bought the company and financed the take-over by issuing
some $800 million in high interest bonds. To pay the dept., Hurwitz doubled the
rate of logging. Since the late 1980's huge tracts of land have been clear-cut.
Economically the result has been a logging boom which will be followed by
inevitable bust when the tall timber is gone. Ecologically the logged land has
been left bear.
The B.C. government nearly owns all the forest land and seems inclined
to support timber interests than acting as guardians of the land, Everyday
loggers cut down more than 1.5 square miles of growth forest. Few native
American tribes there have signed treaties with the Canadian government. After a
struggle, the Haida nations in 1987 won the creation of a $350 000 acre park off
South Moresby Island. A fight continues over 22 000 acre Meares Island, claimed
by the native Clayoquot tribes. In 1984, a blockade by the Clayoquots (off
Vancouver) turned back a boat load of loggers. The vigil to defend the island
lasted for six months, when a court ruling prohibited further logging until the
Clayoquots' claim to the land is settled.
In Conclusion, regulated deforestation can supply us with lumber without
completely destroying the forests, but deforestation which is geared
economically can permanently destroy our ecosystem. If deforestation is used
wisely, possibilities of positive effects take place. Some of these are: Jobs
would be created, the economy would be strengthened, expanding agriculture would
provide much needed resources to underdeveloped countries and people from poor
urban areas could be resettled. Proper deforestation also increases foreign
exchange (for example, our government promotes a new type of harvest and sells
it to other countries).
Still, if deforestation is used badly it will destroy forests, add to
global warming, and destroy cultures. Bad deforestation degrades the ground and
the economic benefits from unwise deforestation barely enriches the community
while the money goes into the pockets of politicians or timber companies.
Furthermore, there is the loss of local products such as fishery, honey, game,
berries and also important species of plants that could help modern medicine.
I believe that if deforestation is not reduced soon, our ecosystem will
be permanently damaged and we will have lost many our resources. Until then you
might want to contact these organizations to find out more about our forests and
become involved: â¬ Association of Forest Service Employees for
P.O. box 11615
Eugene, OR 97440
â¬ Global Relief
P.O. box 2000
Washington, DC 20013
â¬ National Wildlife Federation
1400 Sixteenth St. N.W.
Washington, DC 20036
Zuckerman, Seth. Saving our Ancient Forests. Los Angeles: Living Planet Press,
Westoby, Jack. Introduction to World Forestry. New York: Basil Blackwell Ltd.,
Gallant, Roy. Earth's Vanishing Forests. New York: Macmillan Publishing Company,
Kerasote, Ted. Canada: The Brazil of the North? Toronto: Sports Afield, 1994.
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