• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The Human and Physical Causes of Climate Change

Free essay example:

The Human and Physical causes of Climate Change

There are several different occurrences that cause climate to change, whether they are enforced by humans or the natural environment. These causes can be divided into having a long term or short term effect on the climate.

An example of a long term physical cause is the Milankovitch cycles which can take place within a period of 20,000 to 1 million years, involving the earth altering on its axis or its orbit around the sun. This consists of how much solar power different parts of the earth receive. This corresponds with the number of ice ages throughout the earth’s history and has had effects on seasonality and the distribution of energy over the earth’s surface. Extracting ice cores from either Greenland or Antarctica allows scientists to research further into the Milankovitch theory.

Plate tectonics also play a role in causing climate to change as they move different areas of land into separate climatic regions. The Pangaea theory suggests that when the world first evolved, it was one big land mass and over a period of millions of years, plate tectonics divided it into different continents spread all over the world where climatic conditions vary. As opposed to land moving apart, there is now evidence that continents are moving together but at millimetres per year. The constant change in plate tectonics could result in more land moving to more northern or southern parts of the world, closer to the poles. If this were to happen, then ices sheets would develop blocking off warmer ocean currents, following in a general cooling of the earth. This is also, a long term physical cause of climate change.

The Ice–Albedo effect happens mainly in the Arctic, Antarctica, Greenland and Iceland. Light from the sun is directed on to the land, which is covered in ice and snow, therefore about 70 to 80 percent of the sun's rays are reflected back into space creating a colder atmosphere. Land that is not covered in ice absorbs the light from the sun making the earth warmer.

Another link between ocean currents and climate change is the El Nino Southern Oscillations (ENSO) that takes place in the South-Pacific, every 2 to 9 years. High sea surface temperatures in the Pacific set off a reversal in the regular westward flow of the Trade winds and ocean currents that drift across the tropical pacific from America towards Asia. This causes the climate in America, South America and Australasia to change dramatically. These parts of the world are affected by monsoon rains, very hot temperatures, shifting storms, floods and droughts, which have proven difficult to predict. These changes have severely increased the spread of diseases and damage to homes.  Scientists say that ENSO should not be seen as a secluded incident occurring in the South-Pacific, but as a global phenomenon impacting climates worldwide. This is a significant long term physical cause as the effects are more noticeable and impact thousands of people in all different parts of the world.

Volcanic eruptions since 1980 have demonstrated that they have an impact on climate change. When sulphur and ash is spurted out the vent during the eruption, they rise high into the atmosphere and reflect heat from the sun, having a cooling effect. Furthermore, the dust from volcanic eruptions creates a layer, shading parts of the earth which could result in a decrease in global temperatures within the next 5 years. Volcanic eruptions seem to result in their being a decline in the climate and may contribute towards glacial phases in the future.

Aside from the physical environment impacting climate change, humans also play a role in the causes of climate change, however these causes appear to be quite short term. For example, deforestation has a substantial effect on the environment and ultimately, climate change. When trees are cut down, greenhouse gases such as Carbon Dioxide is released into the atmosphere. These gases insulate the earth, making it warmer.

Deforestation also leaves soil bare and exposes it into absorbing heat from the sun, which has a heating effect too. There is a natural balance that exists between vegetation and the atmosphere, once a lot of deforestation has taken place then an imbalance is created resulting in more environmental problems.

On the whole, the physical environment is having a long term effect on the climate while the human impact is short term. This shows that as much as humans try to reduce their carbon emissions, recycle and generally try to save the environment, they are going to be unsuccessful because what they are doing has an insignificant impact on climate change. The earth is heating itself up and there is little that humans can do about it. However, there has been research that suggests we are due for another ice age. The human and physical causes of climate change are clear, it is what to do about them that is not so obvious.

This student written piece of work is one of many that can be found in our AS and A Level Environmental Management section.

(?)
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Related AS and A Level Geography Skills and Knowledge Essays

See our best essays

Related AS and A Level Environmental Management essays

  1. Managing change by managing risk

    because they see advantages, not just in the new way of doing things, but in being an early pioneer. They are the 'beta testers'. Early Majority (30-40%) These are the ones who constitute a critical mass in any change effort.

  2. Impact of climate change on humans

    United Nations secretary general Ban Ki-Moon says "Climate change already under way is more frightening than any science fiction movie. There is a 90% chance that climate change is caused by human activity and may bring abrupt and irreversible effects."

  1. What are the effects of Deforestation?

    These compounds are converted into ammonia, which can either be absorbed directly by plants or converted into nitrates by microorganism, which are then absorbed. Any remaining nitrogenous material is converted back into N2 and released into the atmosphere by bacteria.

  2. How humans have polluted the Earth

    The word ozone is Greek and means 'to smell'. A picture of an ozone molecule being formed is shown below: A diagram to show the formation of ozone from oxygen atoms is shown below also. This process is called photolysis: Ozone is a weird molecule because it can either be harmful or helpful depending on where it resides.

  1. The causes of desertificationDesertification is the degradation of drylands. It involves the loss of ...

    all parties involved, and private enterpreunership, social mobilization and the application of appropriate technologies such as drip irrigation, soil conditioning, hydroponic crop production and ecotourism projects. The Parties identified the integration of sustainable development policies into economic policies as a challenge to be overcome.

  2. Free essay

    Theory of Climate change

    the ability of poor nations to improve the quality of life experienced by their people. At the beginning of this century there were some 426 million people living in China. This has resulted in a country that has endured the demographic effects of devastating famines, wars, and epidemics for millennia;

  1. Global Climate Change and Climate Protection: Current Summary

    These excess gases capture heat from the sun and cause global warming, increase air pollution, induce glacial and iceberg melting, sea level rising, unstable and more extreme and long-lived weather conditions, and shifting, prolonging and intensifying floods, droughts, hurricanes and El Ni´┐Żo episodes.

  2. Notes on Managing Climate Change.

    Adaptation is usually only locally linked, however mitigation can be local or globally. Local agencies (local councils) decide on actions needed. E.g. the UK government target is for 30% of domestic waste to be recycled by 2010. This is one way to reduce waste to meet the Kyoto Protocol target.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work