Arguments For And Against The Early Anthropogenic Hypothesis

The Great Warming is a book written by Brian Fagan that encompasses the environment and history pertaining to most of the human race between A.D. 800 and 1300. Not only does the book give a new dimension to world history by looking at climate history, but it also provides the reader with an ominous warning of the impact that climate change may have on the human race in the future. Fagan references many civilizations in the book that were affected by the rise in surface temperatures. He goes in depth with them individually to show just how worldwide this climate change was, how each civilization adapted or failed to adapt, and who the winners and losers were during this medieval warming period.

Is climate change caused by mankind or is it simply a natural occurrence? If the answer were as easy as “yes, it is 100% caused by humans,” or “no it’s not at all caused by humans,” there would be very little room for argument. Two questions need to be investigated: 1) Is it probable that such a young species could really be responsible for causing enough air pollution in approximately 250 years, from the 1700’s to mid 1900’s, to alter the climate of the entire planet? 2) Is it probable that mankind’s industrialization from the

The passage declares numerus reasons in hope of justifying the real causes of Little Ice Age existence during 1350 till 1900 CE. On the contrary, the lecture challenges all the aforementioned theories by passage and believes inasmuch as the outdated information used by passage all those clarifications are merely sheer implausible misconceptions. In what follows, three major hypotheses and their critics will be delved into nut briefly.

“Discuss how both direct and indirect scientific measurements of atmospheric composition over the last 10,000 years have informed the climate change debate”.

Some contend that the Anthropocene started with the appearance of agriculture, in light of the fact that specific horticulture related activities, for example, rice paddy water system and deforestation may have prompted sharp ascents in convergences of CO2 and methane as ahead of schedule as 8,000 years prior. Many trust that it was not until the Industrial Revolution that our abuse of fossil fuels and monumental increases of energy utilize and populace began to push us sufficiently far to demonstrate a recognizable human impact.

Has Earth entered into a new geologic epoch, characterized by human influences? A recent study, spear-headed by the British Geological Survey, has come to the conclusion that man’s global impact has become distinct enough to end the Holocene and effectively begin the Anthropocene. Published in Science, the study identifies how man’s impact on our oceans, resources, climate, and vegetation has altered the sedimentary makeup of the planet. Massive species invasions, increased rates of extinction, genetically modified plants, redistributed metals, sediment, hydrocarbons, fossils, increased levels of carbon, nitrogen, and phosphorus all combine to create signals that geologists interpret to denote a break in the Holocene

Anthropocene refers to the start of a time where human influence on the earth’s ecological and geological state rapidly increased. This rapid increase is known as the “Great Acceleration” which takes place from the mid-20th century and continues on today. A push was made to distinguish this time from the previous epoch known as the Holocene period because of the dramatic impact that humanity is now having on the environment. The Anthropocene period is characteristically different because the changes in the ecological environment are being rapidly affected and changed due to human activity not purely natural means. While humans were active during the Holocene period they did not begin to affect their environment

The first argument examined on the man-made global warning side is that increasing greenhouse gases caused by human activities is causing directly observed climate changes. The first resulting climate change discussed is warming global surface temperature. There has been an increase in global surface temperature of 0.74 degrees C since the late 19th century. In the last 50 years alone the temperature has increased by 0.13 degrees C per decade. North America and Eurasia have seen the largest increase in warmth. However, some areas of the earth have actually cooled some this past century (Easterling & Karl, 2011, para6). After the mid 20th century 70% of the global land mass saw reduced diurnal temperatures. From 1979 to 2005 the maximum and minimum temperatures have shown no change; both indicate warming (Easterling & Karl, 2011, para10). Furthermore, borehole temperatures, snow cover, and glacier recession data all seem to agree with recent warming (Easterling & Karl, 2011, para11).

During Late Pleistocene a megafaunal mass extinction took place. It’s still debated whether humans are to blame for this, since this megafaunal extinction happened after the arrival of humans or if climate change is entirely to blame. Fossil evidence has been of great help in finding what factors might’ve caused this extinction. This mass extinction that took place is related to the Anthropocene because if humans were the main cause, humans need to be more careful now because their actions may lead to more extinctions. The observations made were the types of species that went extinct with climate change, and what humans did to contribute to this mass extinction.

Climate change began in the 1820s with Joseph Fourier and in the 1860s with John Tyndall. Fourier put into motion the “greenhouse effect.” An effect where trapped gasses in the lower atmosphere absorb the sun’s heat. Tyndall found that “greenhouse gasses” cover the earth like a sheet. This is how the earth keeps cool and warm. Yet, too much greenhouse gasses can be futile. During this time, humans did not know that they were the ones causing implications. 100 years later, Svante Arrhenius proposed that “…doubling the CO2 content of the planet’s atmosphere would raise its temperature by 2.5 to 4.0 degrees Celsius” (Frank, para 7). Any slight change in temperature can offset the ecosystem. People began to act to save their planet, but there are still many in denial.

The Great Warming by Brian Fagan claims that environmental changes (most commonly prolonged droughts, El Niños, and La Niñas during the Medieval Warm Period) affect human civilization, including human’s trading abilities, overall movement, and quality of life. He examines the world’s ancient climate warming, known as the Medieval Warming, between the 10th and the 15th centuries, also mentioning the preceding and succeeding centuries. Fagan gathers his research using studies conducted by archaeologists, historians, and paleoclimatologists. Throughout his book, he refers to direct methods to study climate change, such as instrument records and historical documents, and indirect methods, such as ice, deep sea cores, coral records, and tree rings. Fagan digs into the rise and fall of multiple civilizations around the world as an effect of The Medieval Warming Period. As well as examining civilizations across the world, he attempts to connect the climate change patterns during The Medieval Warming Period to the current global warming faced today. The Great Warming discusses positive and negative connections between climate change and human civilizations across the world, starting in Europe and working its way into Asia, North America, South America, Africa, and even covering the arctic ice caps; however, throughout the book, Fagan has a hard time connecting his various ideas back to one main topic and can easily stray from his point about the effects of climate change.

Current data reveals that the concentration of Carbon Dioxide in the earth's atmosphere is approximately 387 parts per million, which is roughly a 31% increase in the period 1750 to 2009. Consequently, it is evident that such increases in temperatures have caused a warmer planet (7). It is also evident that it is impossible to reverse the developments of industrial revolution. This means that as the advancements of industrial revolution continue and as energy demands increases, it is possible that this trend of climate change will continue for decades to come (McAloon, 8). The consent of the climate research community is that it most likely already affects climate noticeably and will compel significant

Since before the industrial evolutions humans have been pumping green house gasses—carbon dioxide, water vapor, methane, nitrous oxide, and chlorofluorocarbons— into the atmosphere however, it wasn’t until recently that the amounts being produced are shoving the Earth into a sixth extinction. While the causes of this upcoming extinction are constantly debated on it has earned itself the name Holocene extinction. This name is derived from the theory that humans are the main contributors to this extinction. To investigate the cause Elizabeth Kolbert, and American journalist and professor at Williams College, took the world on a wild and saddening journey on the human contribution to this looming extinction in her novel, The Sixth Extinction; An Unnatural History. Not only does Kolbert’s book explain how humans have contributed to global warming and its effects on life on land but also ocean acidification and how life under the sea has changed over the years.

In fact, since the beginning of the industrial revolution, human activities such as the burning of fossil fuels, deforestation and agriculture have caused the concentrations of greenhouse gases in the atmosphere to increase substantially. A marked rise in the global temperature has been related to these human activities and CO2 emissions, and this temperature rise is believed to be the result of an enhancement of the natural Greenhouse effect. And as a result, global warming arises.This awareness has led many researchers to investigate possible causes and effects of this temperature rise. However, as much knowledge about the climate system is lacking, numerous researches on that issue have led to a great deal of debate. At the moment, the way the climate system will respond to these human activities is difficult to predict, for too many processes are not understood well enough. One absolute reality though is the fact that the global climate system will respond to increasing temperatures. Moreover, this response could have irreversible consequences for the habitability

Even before Homo erectus first stood up on his hind legs, humans have had an enormous influence over the environment and atmosphere. They have used land, oceans, and other natural resources to help further their expansion and growth. Unfortunately, while the human race flourished, the atmosphere and environment did not. Humans released toxins into the air with their large-scale fires and killed many species to extinction. However, global warming is one of the largest and most current dilemmas the Earth is facing. Over the past century, the temperature of the Earth’s surface has risen 1° C and in the past fifty years, humans have been the primary cause of the warming of our planet.