The History of Global Climate Change Essay

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 glaciation is very confusing to those who don't know about glaciers so here is some background information. The last glacial advance started about 75,000 years ago and the last

A glacier occurs when the climate of an area is so cold that new snow does not completely melt each summer and more snow is added in the winter. After many winters the accumulation of this snow becomes compact and re-crystallizes, thus forming a glacier. Currently, glaciers cover about ten percent of the Earth's surface. Yet, in the past, glaciers covered much more land and were thousands of meters thick. (Tierney)

The Siberian tundra is basically melting away overtime, even though it has been frozen for tens of thousands of years. At such a fast rate it is speculated that it is influencing global warming. The landscape is changing fast. In the last three to four years, the underlying

Glaciers have helped define the topography of earth for many years. A glacier is a large mass of ice that has been compacted of snow and ice for a long period of time. The ice age we will be focusing on is the Pleistocene era, which was “a period that began about 2.5 million years ago and ended about 10,000 years ago” (513). This was the most recent ice age where it helped formed our present-day lands. During this time, ice covered about 19 million square miles which was about 1/3 of earth’s land surface (515). Many parts of all the continents were covered with ice and that had a great effect on our topography due to the glaciers it created.

Even today when people talk about glaciers the term “Ice Age” comes up. During the past 2 ½ million years the world fought with ice sheets roughly fifteen times. “Approximately 34 m.y. ago, Earth’s climate transitioned from a relatively warm, ice-free world to one characterized by cooler climates and a large, permanent Antarctic Ice Sheet” (Science Letter, 2010). This time period involved glacial advances and withdrawals called glaciations and deglaciations. The most current glaciation in North America is known as the Wisconsin.

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).

Mendenhall Glacier is the most recent environmental victim of a warmer planet. First measured in 1911, the glacier has receded by more than 2900 meters (Braasch, G. 2011). The marvelous thing about glaciers is that they can regenerate their mass through snowfall, but they can lose their mass due to sublimation, water evaporating from the ice, and melting. Sadly, this isn’t the case anymore as the summers out heat whatever the glaciers had tried to regenerate during the winters. Since 1980, glaciers on average have melted 17 meters of water (“NOAA Climate.gov”. 2017). When glaciers melt, the resulting water adds to overall volume of the ocean. According to The National Oceanic and Atmospheric Administration, the global average of rising sea levels has been 3.4 millimeters a year since 1993 (“NOAA Climate.gov”. 2017). Before 1993, the average rise of sea level a year was only at

Many locations around the world in places where its snows throughout the year temperature stays cold and frosty. This will cause snow not to melt but sometimes creates a firn. When the snow gets suppressed deeper in the snowpack it can turn in to a glacier ice. “Glacier is massive, long-lasting, moving mass of ice compacted snow and ice” (Thompson, 2007). These gigantic moving mass can only be made on land where the quantity of snow is more abundant than the snow that had previously melted in the summer. Glaciers are influenced by geologic forces, temperature changes, and snowfall (RioLearn, 2016). There are two types of glaciers the first type is an alpine glacier and the

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).

Glaciers are one of the most fundamental phenomenon on the planet, and much of their purpose and impact on earth has been well documented and published. Ice sheets, Ice Caps and Glaciers trap nearly 90% of the world's fresh water, and are replenished by snowfall each year. Their existence on this planet dates back 650,000,000 years and yet they are always moving, always shifting and always melting. Before, human existence and even during the brief era of humans, ice dominated all of the earth's landmass and have regulated, created and altered many of the landscapes around the world.

Climate is inherently variable. Climate changes from place to place and it varies with time. The world now faces one of the complex and important issue it has ever had to deal with: climate change. Climate change today is one of the biggest concerns of human beings on the planet and the effects of climate change are undeniable and it may cause environmental, social, and economic threats to the planet. We already know and easily can highlight several signs of climate change. They are: rising global sea level, widespread melting of snow and ice, rapidly changing ocean and global temperatures, and other signs. So, what are the causes of climate change? Is it natural or do human beings cause it? Well, in both cases we would be right. The climate change can be affected by natural factors, such as solar output, volcanic eruptions, and the Earth’s orbit around the Sun. Also, climate change can be affected by human activities such as, deforestation, burning fossil fuels, causing ozone hole, and building mass destructive weapons and using them on earth that causes a huge radioactivity on earth. Currently, the threat of global climate change does not threaten some nations to the extent of others. Compare the United States with the rest of African countries. We live in prosperity and in much easier time than the rest African countries. Most African countries cannot grow anything on their lands because of climate change. At the end, climate change might affect everyone on

The South American Cryosphere is composed of both tropical and temperate ice masses. The Patagonian Icefields in the Southern Andes represent a major temperate ice mass in South America (Warren and Sudgen, 1993). Although retreat of glaciers in the Southern Andes have been documented earlier (Rigot et al. 2003; Lopez et al. 2010; Willis et al. 2012), glacier of Southern Andes have long been neglected for mass-balance measurements. Due to the remoteness, inaccessibility, and tough weather conditions in the Andes, field-based mass-balance studies are sparse (Aniya et al. 1996). Because glaciers in this region have not been as closely studied, there is an uncertainty in the estimation of the contribution of these glacier-melts to the sea level

At 5,895 meters, Mt. Kilimanjaro is the tallest freestanding mountain. But lately, the glaciers on this towering mountain have been noticeably decreasing. The media has conflicting headlines and theories. Scientists have been studying this problem for many years, the receding glaciers have not been narrowed down to one exact cause. Theories range from climate change to undersurface magma, yet, no one knows how we can limit the melting glaciers.

Climate change could be described as any process that causes adjustment to climate system be it a volcanic eruption to a change in the solar activity. Today, however, the phrase is most often used as climate change caused by humans. Climate change is also used commonly with another phrase – "global warming" – reflecting scientific observations of strong warming trends over the past century or so. Indicators like rising sea levels, retreating snow cover and glaciers, longer growing seasons and shifting wildlife has alarmed scientific community unanimously agreeing that the earth has warmed in the last century. Experts however are of the opinion that climate change is a more accurate phrase than global warming as the latter is just one component affecting the larger climate systems of the earth.