Global Warming on Forests - Essay Example

Global Warming and Forests The greenhouse effect is a term that describes an increase of the average global temperature and is often associated with global warming which is the subject of great debate and concern worldwide. Although warnings about the human generated causes of an enhanced greenhouse effect and the subsequent catastrophic outcomes have been sounded for over 100 years, global warming has only recently become an important political matter, at least in the U.S. This discussion will first define the greenhouse effect then explain how naturally occurring and man-made gases affect it along with examples of the consequences forces have on the forests of the world and vice-versa. Essentially, the greenhouse effect functions in the following manner. When sunlight pierces the atmosphere and hits the earth’s surface, not all of the sun’s solar energy is absorbed. Approximately a third of it is reflected back into space. Specific atmospheric gases serve in much the same way as does the glass of a greenhouse, thus the terminology. These gases allow sunlight to penetrate then trap some of the solar energy which heats the earth (Breuer, 1980). It is a delicate balance and because these greenhouse gases have been artificially augmented by man-made sources, more build up in the atmosphere has occurred thus trapping more of the sun’s energy and reflecting less back in to space. This occurrence is causing the earth to warm. Carbon Dioxide (CO2) is the most prevalent of the greenhouse gases. Trees absorb CO2 and when they die, CO2 is restored to the atmosphere. The clearing of forests by mass burning, which is happening at a phenomenal rate in the tropical rain forests, is decreasing the amount of CO2 that is absorbed and increasing the amount that is added to the atmosphere. CO2 supplies about half of the total gases that create the greenhouse effect (Breuer, 1980). Since 1970, at least 20 per cent of Amazon rainforest has been lost from deforestation. Ecologists and scientists warn that another 20 per cent will be lost within the next 20 years. If this were to occur, the ecological system that sustains the forest and thus the planet’s weather patterns will start to disintegrate. The rising temperature of the Earth, due to global warming, will exacerbate the situation and cause droughts which will lead to massive wildfires in the region. Instead of life-giving oxygen which is now furnished by the lush rainforests, the fires will expel great amounts of carbon dioxide into the atmosphere. Although deforestation is contributing heavily to the excess of CO2 in the atmosphere, a larger portion is caused by the burning of fossil fuels such as oil and coal. Fossil fuels are burned by factories, vehicles and electricity-producing power plants to name a few sources. The vast majority of this excessive fuel consumption and its poisonous, pollutant and greenhouse-enhancing byproducts are located in the U.S., Europe and Russia (Breuer, 1980). The collective rainforests of the world act as a climatic sponge storing much of the world’s rainwater, of which the Amazon rainforest accounts for more than half. Trees in the rainforest recycle water drawn from the forest ground. This, combined with the moisture that evaporates from the leaves is released into the atmosphere from whence it came. If not for this enormous amount of rainwater supplied by rainforests, rivers, lakes and land masses would essentially dry-up spawning droughts of epic proportions. Irrigation farming would be greatly curtailed. Disease, starvation and famine on a worldwide scale will be the direct result of deforestation. Trees cleanse the atmosphere by absorbing carbon dioxide and providing oxygen. Burning trees in the rainforest increases the amount of carbon in the atmosphere and at the same time reduces the amount of trees needed to absorb it. This contributes to global warming, a phenomenon which is already threatening the survival of the planet. (“Why” 2007) The scientific community agrees that global temperatures are rising due to the burning of fossil fuels which are damaging the protective atmospheric Ozone layer by changing its composition. Human pollution is changing the climate of our earth and has increased global warming in the past half century. The effects are being felt worldwide, not just in the U.S. where most of the CO2 emissions are generated. Global warming is further evidenced by the well-documented melting of glaciers along with thermal expansion of the oceans, which have contributed to an increase in sea level over the past century of about six inches in that country. (Trenberth 1997). Motor vehicles are a major cause of air pollution as is fuel burned for the heating of homes and powering industry along with the toxins emitted from stacks at coal-burning power plants. “Vehicles produce high levels of carbon monoxides (CO) and a major source of hydrocarbons (HC) and nitrogen oxides (NOx), whereas, fuel combustion in stationary sources is the dominant source of sulfur dioxide (SO2)” (Breuer, 1980, p. 70). Most scientists worldwide accept the sufficient evidence that suggests global warming is already well underway and cannot be reversed anytime soon. They and reasonable people of all backgrounds and nationalities agree that if CO2 emissions are not greatly reduced and soon, the resulting greenhouse effect will alter the climate and possibly the sustainability of humankind. The rainforests has been characterized as the ‘lungs of the world.’ It is astonishing that though people know that without trees, they are without oxygen. Global warming exacerbates the destruction of the rainforests and their destruction intensifies global warming, a vicious circle dooming the life on earth. Saving the Amazon rainforest is a good idea whether or not its destruction would also likely kill most everything on earth. Even if all the scientists, environmentalists, government and scholarly studies were proved 100 percent wrong and nothing outside a few desolate tribes, some frogs, snakes and birds would notice if the rainforest was transformed into desert, it would still be worth saving at any cost due to its beauty, uniqueness and numbers of species and medicinal potential. Much as the global warming issue, whose destiny is tied to deforestation, even if climate change due to carbon monoxide emissions were proved a myth, reducing air pollution still makes sense. Deforestation is the leading reason that soils in the forested areas lose their sustainability. Farming techniques and overgrazing increase soil degradation and erosion. The solution begins with severing the root cause. The voracious consumerism of industrialized nations is depleting the forests but if the people of these nations could come to understand the implications of deforestation and learn the specific companies within their country contributing to it. For example, Kentucky Fried Chicken and McDonalds have recently been reported on the national news as major purchasers of soybeans grown in former rainforest lands. The solution to automobile emissions may lie in alternative fuels. Promising future alternatives to crude oil, vegetable oil can be substituted for diesel fuel while ethanol is an effective petrol additive. Given the fact that fossil fuels are finite and its emissions are threatening every living thing on earth, why have most nations been slow in efforts to reduce the use of oil in favor of more viable energy sources? The economic consequence of doing nothing is far greater than solving the problem through legislation. If ‘we’ choose not to do anything or to insist a problem does not exist, there will cease to be a ‘we’ as weather patterns become overtly hostile and air, water and food supplies will either become non-existent or too poisonous to sustain life. Works Cited Breuer, Georg. “Air in Danger: Ecological Perspectives of the Atmosphere.” New York: Cambridge University Press. (1980). Trenberth, Kevin E. “Global Warming: It’s Happening.” National Center for Atmospheric Research. (1997). November 30, 2008 “Why are the Rainforests Important?” Rain Forest Concern. (2007). November 30, 2008 Read More