Global Issues Of The 21st Century Essay

In the last 100 years, the amount of greenhouse gases in the atmosphere has increased, causing the Earth to warm by an average of 0.6 degrees celsius, largely a result of burning fossil fuels for energy, transportation, and land use changes increased for food production. The basic science is straightforward and climate researchers have shown that gases such as carbon dioxide, methane and others can trap heat in the Earth’s atmosphere, causing a phenomenon known as the greenhouse effect. Human activities such as industry, transport, energy generation and deforestation all produce these greenhouse gases. In the last 20 years, concern has grown that global warming is inevitable and now considered most probably caused by man-made increases in

Just in the last 650,000 years there have been seven cycles of glacial advance and retreat, with the abrupt end of the last ice age about 7,000 years ago marking the beginning of the modern climate era — and of human civilization. Earth-orbiting satellites and other technological advances have enabled scientists to see the big picture, collecting many different types of information about our planet and its climate on a global scale. This body of data, collected over many years, reveals the signals of a changing climate.

The industrial revolution began in the 17th century and made significant change in the world. An era was over and the new one was beginning. The revolution has advantages and disadvantages. Rising of living standards, improving of health, lifetime and trade system are its advantages. On the other hand, manufacturing has caused major problems such as deforestation, excessive use of fossil fuel sources, irresponsible industrialisation and agricultural development. These changes have increased world’s atmospheric concentration of water vapour, CO2, CH4 and other gases (Stocker, 2013). These gases capture part of energy receiving from sun and trap this heat inside atmosphere that causes rising temperatures on the earth’s surface. Naturally, for continuation of life these gases are necessary, but result of the human events these gases has produced more than plants and environment need (Robins, 2016). Also, we call them Green Houses Gases because they have the similar effect like the ‘greenhouses’ utilised to increase condition of vegetables.

Earth has experienced many episodes of dramatic climate changes with different periods in earth history. There have been periods during which the entire planet has been covered in ice and at another time it has been scorchingly hot and dry. In this regards, earth has experienced at least three major periods of long- term frigid climate and ice ages interspersed with periods of warm climate. The last glacial period which current glaciers are the result of it, occurring during the last years of Pleistocene, from approximately 110,000 to 10,000 years age (Clayton, 1997). Indeed, glaciers present sensitive indicators of climate change and global warming and by estimating and monitoring the dynamic evolution of these ice masses, several

The greenhouse effect is how the Earth naturally warms up. During the greenhouse effect, the sun radiates it heat into our atmosphere. From there, most of the heat gets trapped in the Earth’s surface, which is later released back into our atmosphere. At the lower atmosphere, water vapor and carbon dioxide are the gases that absorb most

It follows the Milankovitch cycles, cycles that determine the timing of the seasons and amount of solar radiation that enters the atmosphere. This variation is caused by the shifting in the Earth’s orbit and rotation. Because of these changes, the Earth endure periods of cold and warm cycles (Ice Age and Past Climates, n.d.). Before the Little Ice Age, there was the medieval warm period, or MWP. This warming has said to have started in 900 CE and lasted until 1300, bringing warm conditions for most parts of the world, predominantly in the Northern Hemisphere. Although there is no sure measurement to how much warmer the Earth’s surface temperature was during this time, some scientists estimate the change to be about 1-2 degrees Celsius higher (Rafferty,

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).

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.

It has been observed through various researches that in the last century, average temperatures across the globe increased by over 1.3°F with an increase of more than two times in the Arctic. (Bates, Kundzewicz, Wu, & Palutikof, June 2008). The results of climate change can also be seen in changing precipitation patterns, increases in ocean temperatures, changes in the sea level, and acidity and melting of glaciers and sea ice (USEPA, 2014).

The greenhouse effect is when the heat from a planet's air warms the planet's surface to a temperature above what it normally would be without its air. What causes the greenhouse effect is that energy comes from the sun and reflects off of the earth’s surface and then goes back to the atmosphere as a bunch of heat. It affects the Earth by making the atmosphere warm.

For billions of years, the earth has gone through cycles of Ice Ages. As Mann and Kump wrote, “Ice Ages are marked by episodes of extensive glaciation [glacial period], alternating with episodes

In the last 100 years, Earth’s average temperature has risen by 1.4°F. The rising global temperatures have caused changes in weather and climate. Global warming refers to the ongoing rise in the average temperature near Earth’s surface. This is causing a climate change, which refers to any significant change (major change in temperature, precipitation, or wind patterns) in the measures of climate lasting for an extended period of time (several decades or longer). Due to this, it is projected that the temperature will rise from 2 to 11.5°F in the next hundred years (US EPA, 2014). The “drivers,” which are the principal causes making this occur, are very controversial. It is debated whether a change in temperature is due to the work of

One of the main reasons that earth’s temperatures are rising are due to greenhouse gases. Greenhouse gases are created when humans burn fossil fuels such as coals, natural gases, and oils to produce heat or electricity. These gases are then capable of trapping infrared radiation sent by the sun. Once these

The primary cause of climate change is the human expansion of the greenhouse effect. The greenhouse effect is a natural occurrence, which NASA defines as “the warming that results when the atmosphere traps heat radiating from space” (NASA). During the greenhouse effect, heat from the sun passes through the atmosphere, which is made up of various gases. When the heat from the sun reaches the surface, some of it radiates away from Earth, back into space. However, some of the gases in the atmosphere, known as greenhouse gases, absorb this heat, preventing it from escaping (World Meteorological Organization). The greenhouse effect keeps the Earth at a habitable temperature. The World Meteorological Organization, or WMO, states that the greenhouse effect and

The issue of global warming should be on the list of our top priorities. Studies show that the average of global temperatures have risen since the Industrial Revolution began. Since the Industrial Revolution, human emissions has quadrupled the frequency of certain heat extremes and many scientists have warned that a failure to bring greenhouse gases under control could eventually lead to a 62-fold increase in extreme heat blasts (Gillis Justin A17). Most of the increase is due to human activities, especially the burning of fossil fuels and deforestation. These activities contribute to a build-up in carbon dioxide and other gases in Earth’s atmosphere. The Earth’s atmosphere is made of gases like nitrogen, carbon dioxide and oxygen. These gases act as a blanket that covers and gives us warmth, but once these gases such as carbon dioxide absorbs heat, but does not release it back into space in which causes the increase in global temperature. This is called the greenhouse effect because it only traps heat but does not release it.