07 Feb 2010
Sample Essay: Climate Change Two Perspectives
Climate change is one of the most contentious public policy issues facing the world today. While there is practically no argument challenging the reality of the ongoing global warming, what is essentially being contested is whether climate change is anthropogenic or simply a natural, cyclical phenomenon upon which human activities do not cast a major impact. This paper will attempt to compare these two opposing perspectives on climate change.
Science of Climate Change
A comparison of the differing perspectives on the obtaining global warming takes off from the basics of the new science of climate change. This field covers several disciplines including chemistry, meteorology, physics, biology, oceanography, biology, and even sociology (Global Climate Change).
The beginning of climate change science can be traced to Svante Arrhenius, a Swedish scientist who concluded in his 1896 study that changes in of carbon dioxide or CO2 could produce effects on the climate. Later, in 1938, Guy Stewart. Callendar, an English engineer, asserted that the increased CO2 levels had given rise to a warming trend (Scheider).
Greenhouse Effect
Because of the transparency of the atmospheric gasses to visible light, sunlight is able to largely penetrate the earth’s atmosphere and reach the surface, where it is absorbed heated up, and thereafter re-emitted in the form of infrared radiation. In this form, this energy is not able to completely escape to space because clouds and certain other naturally-occurring particles and gases absorb infrared radiation. The trapped infrared energy is emitted again in opposing directions-towards the surface and back to space. The re-emission downwards particularly adds heat to the layers below, leading to the further warming of the surface of the earth. Ultimately, the presence of greenhouse gasses accounts for the higher surface temperature, with a difference of 33 °C (60 °F) between the actual surface air temperature and what would have been without the greenhouse gases (Schneider).
The presence of natural greenhouse gases has made the plant more habitable. Water vapor, carbon dioxide, and to a limited extent, also methane, constitute the most important of the naturally occurring greenhouse gases (Schneider). The fact that human activities contribute to the content of greenhouse gases in the atmosphere forms the crux of the global warming debate.
Anthropogenic Perspective
Humans, being part of the biosphere, have always influenced the earth’s climate system. This climate system is made up not only of the atmosphere and the hydrosphere but also of the cryosphere, biosphere, and lithosphere. Thousands of years ago, when nomadic humans discovered agriculture, they cleared vast tracts of land, thus casting considerable impact on regional climate-a development that will be sustained for centuries since. Humans would engage in slash-and-burn farming and other agricultural practices, inland water regulation or building development-activities that altered how the Earth’s surface and near-surface winds of the atmosphere back-scatter solar radiation (cited in Hillerbrand and Ghil 2132).
At the same time, human activities have been influenced by climatic variations, either promoting or constraining them. It is only rather very recently, with advances in science, technology and the resulting construction of sophisticated infrastructural systems have humans considerably lessened the impact of climatic variations on their activities (Schneider).
However, according to the anthropogenic paradigm of climate change, it is at the point when humans became less restrained by variations in climate that their activities began to considerably contribute to global warming, leading to the changes we now see around us. These changes include the erratic weather patterns and perhaps the more potentially dramatic effects on animals and plants. This came about beginning around the 1800s, the dawn of the Industrial Revolution, which is the point when human knowledge in science and technology allowed people to alter more the environment to conform more to their plans and establish new lifestyles.
This perspective holds that fossil fuel burning and other human activities have raised the levels of CO2 and other greenhouse gases in the atmosphere, significantly contributing to global warming. According to the IPCC or Intergovernmental Panel on Climate Change, the body formed by the World Meteorological Organization and the United Nations Environment Programme, the average earth surface temperature has risen by about 0.60 in the 20th century. This temperature level is believed to be warmer than at any point in the past century, with the warmest years occurring within the last ten years (Global Climate Change). The IPCC in its updated 2007 report points to human activities as the likely cause of global warming, being cautious to point out that given the complexity of the workings of the earth’s climate, full certainty may not be reached (Weart and American Institute, Introduction).
While it is a historical fact that early on, people did not seriously consider the impact of human-induced CO2 on the world’s climate, military researches during World War II and the Cold War led to further understanding of the CO2 impact. Scientists began to understand that the absorption of CO2 by the oceans was slow, essentially owing to the exponential growth of industry and population (Feldman and Weart). In the 1950s, scientists discovered the possibility of global warming almost by accident (Weart and American Institute, The Carbon). In 1965, Lorenz, of the Massachusetts Institute of Technology, suggested during a conference that global warming could lead to disastrous ’surprises’ (Scheider). C.D. Keeling, for his part, found that atmospheric levels of CO2 were rapidly rising.
In contrast to the climate change of the past, the obtaining global warming is being initiated by human activities that add greenhouse gases to the atmosphere. Furthermore, the rise of temperature following increases gas levels involved a short time lag of only a few decades instead of centuries. Thus the rates of climate change are hugely faster than the shifts in orbit responsible for the ice ages of the past (Feldman and Weart).
The 2005 comparison of computer calculations with protracted ocean basin temperatures showed near matches of rising temperatures and calculated predictions of where greenhouse effects should be. This was seen as proof of temperature imbalance, with the planet absorbing close to an average of one watt per square meter of sunlight more than it was reflecting into space-caused by no less than greenhouse gases (Feldman and Weart).
It is worth noting that the global warming effects of worse droughts, heat waves, severe storms and floods were correctly predicted as early as the 1950s-to start manifesting sometime in the year 2000 (Feldman and Weart). Today, those who subscribe to this perspective hold just minor disagreements in terms of the details of the processes underlying the general themes (Global Climate Change). The projection is that by the close of this century, the average temperature of the earth can range from about 1.4-60C, depending on how successful the restrictions of greenhouse gas emissions will be (Weart and American Institute, Introduction).
Climate Change as Natural Phenomenon
In the United States, the science of climate change has been particularly politicized. The administration of George W. Bush has been criticized for the suppression of scientific reports on global warming, beginning with the deliberate withholding of the “National Assessment” report made during the Bill Clinton administration, which reported that on the whole, global warming can lead to some benefits but most of its impacts would be adverse. A 2003 bill proposing a weak system of carbon emissions trading was defeated following opposition from the administration and the denunciation by certain senators as to how its restrictions would ruin the economy. Later, Republican Senator James Inhofe tried to show that global warming was “the greatest hoax ever perpetrated on the American people” by holding hearings in the hope of producing credible and scientific evidence or testimonies supporting his stand; however, it is said that even his fellow Republican lawmakers started to doubt the wisdom of his extreme position (Weart and American Institute, Government).
The position of Sen. Inhofe can be said to encapsulate the perspective that global warming is but a natural scheme of things and that the anthropogenic view is merely propaganda against the use of fossil fuels. The relatively fewer climatologists, public figures and adherents of the non-anthropogenic perspective do not actually contest the proposition that the earth is undergoing global warming. They acknowledge the reality of the presently occurring change in the global climate, beginning with the onset of the Industrial Age in the 1800s. The difference is that this perspective also cites the history or pattern of the recurring climate changes the planet has gone through while minimizing the role of human activities in the picture (Lupo).
According to this view, there are a number of major causes of global warming, including ocean circulation, volcanic eruptions, solar variations, and orbital variations. Herein, human-induced emissions of CO2 through fossil fuel burning, along with other greenhouse gases, constitute just one factor (National Academies). It holds that global warming is driven more by natural causes than by human-induced rise in greenhouse gases. This perspective points to the supposedly continuing debates in terms of (1) what role carbon dioxide plays in the carbon cycle; (2) how exactly the planet’s climate works; and (3) questions on the reliability of climate models, among others (National Academies).
This view of human activities not being the cause of global warming is nothing exactly new. After around the 1970s when science was just about only beginning to understand the intricacy of the earth’s climate even as improved computer models have already been developed, scientists argued over how deforestation and agriculture figure in the atmospheric carbon dioxide levels amidst the lack of information on the interaction of living ecosystems with the atmosphere.
Evolving Science
There remain a lot of questions to be answered in the science of climate change. The atmosphere, with its various layers of air having temperature patterns each, presents scientific challenges in terms of the understanding of whether temperature or air circulation changes comprise complex longer-term cycles. It is also not yet fully understood how the interconnection existing between the air, land and sea may multiply the effects of any climate change (Global Climate Change).
Herein, the oceans considerably figure in the regulation of climate, as bodies of water comprise over 70% of the planetary surface, absorbing great amounts of energy from the sun. As in the past, the oceans stand to greatly influence future changes in the global climate, bet they induced by natural cyclical changes or by anthropogenic activities (Global Climate Change).
The cryosphere will also continue to play an important role in climate change because its reduction/melting (or any expansion/polar water freezing) affects sea level, air temperature, storm patterns and ocean currents. The Polar Regions, it should be noted, present enormous significance to climate change science because these frozen masses contain detailed records of the earth’s past climates. Re biosphere, as global warming presents potential devastation on a number of species, given land developments that obstruct what would have been animals’ migration response option, the fossil and other records they leave can also help in the understanding or detection of climate change (Global Climate Change).
The study of climate change is a complex science. As it is, the interpretation of climate change data is difficult but predictions of future changes present even greater challenges (Global Climate Change). Climate models, which are complex computer-based simulations, are herein used but how reliable these are really depends on the number of variables and measurement accuracy.
Conclusion
The IPCC, the main body representing the consensus holding the anthropogenic perspective of climate change, was cautious enough to point out that climate change science may be understood with full certainty. The contrarian view seems to capitalize on this, in the process casting doubt on whether human activities indeed significantly contribute to global warming. In terms of the number of adherents, the anthropogenic perspective is definitely more of mainstream: while the IPCC-portrayed consensus may not be as solid, the fact is that there are fewer scientists who believe the obtaining climate change is merely a cyclical phenomenon. At any rate, both perspectives agree that global warming is happening now. The difference in the views of what mainly causes the warming of the planet will spell out the great divide between the public policies that they could give rise to.
Works Cited
Feldman, Theodore and Spencer Weart. Changing Sun, Changing Climate? Web. 25 Oct. 2009.
http://www.aip.org/history/climate/solar.htm
Global Climate Change. Web. 25 Oct. 2009. http://www.exploratorium.edu/climate/
Lupo, Anthony. Anthropogenic Global Warming: A Skeptical Point of View. Missouri Medicine.
105.2 (2008 March/April). Web. 25 Oct. 2009. http://weather.missouri.edu/
gcc/LupoMOMed.pdf
Schneider, Stephen. Climate Change. February 2005. Stanford University Site. Web. 25 Oct.
2009. http://stephenschneider.stanford.edu/Climate/ClimateFrameset.html
Hillerbrand, Rafaela and Michael Ghil. Anthropogenic Climate Change: Scientific Uncertainties
and Moral Dilemmas. 21 Feb. 2008. Physica D 237 (2008) 2131-2138. Web. 25 Oct.
2009. http://www.atmos.ucla.edu/tcd/PREPRINTS/RH&MG-Warming_ethics-
Physica_D’08.pdf
National Academy of Sciences. Global Warming Facts & Our Future. Web. 25 Oct. 2009.
http://www.koshland-science-museum.org/exhibitgcc/causes01.jsp
Weart, Spencer; and American Institute of Physics. Government: The View from Washington,
DC. Web. 25 Oct. 2009. http://www.aip.org/history/climate/Govt.htm
Weart, Spencer; and American Institute of Physics. Introduction: A Hyperlinked History of
Climate Change Science. Web. 25 Oct. 2009. http://www.aip.org/history/ climate/summary.htm
