Author: Ceorge Christodoulou
The green-house effect is the most important cause behind global warming. In fact global warming is known as the greenhouse effect. This phenomenon leads to an increase in the Earth temperature due to certain gases like CO2, nitrous oxide, and methane. These gases trap the energy from the sun and without them the heat would go back into space and Earth would be one massive iceberg. Since these gases warm the Earth, they are known as greenhouse gases.
In the last couple of decades, people have started using glass houses to grow plants in winter and these are called greenhouses. Typically, these houses will trap the heat from the sun. The glasses in the greenhouse let the light through and at the same time prevent the heat from escaping.
As a result, the greenhouse heats up to keep the plants alive in the winter. Similarly, the greenhouse gases in the Earths atmosphere work like the glass and prevent the heat from escaping. The sunlight enters piercing through the cloud of greenhouse gases and when it reaches the Earths surface, it is absorbed by land, water, and air.
After absorption the same energy is sent back into the atmosphere. Some of it remains trapped in the atmosphere due to the greenhouse gases and this energy makes the Earth warmer. Since there has been an increase in CO2 emissions in the last couple of decades, more and more heat is being absorbed in the atmosphere. This is increasing the temperature of the Earth gradually and causing global warming.
Author: Nathalie Fiset
If the greenhouse effect has again been currently in the news, it is probably because it is once again being blamed for causing global warming. Stronger hurricanes, periods of extreme weather, heat waves, the frequency of the El Nino phenomenon, these are all attributed to global warming. But how does the greenhouse effect figure in all these?
What is the greenhouse effect?
The greenhouse effect is the ability of our planet’s atmosphere to trap and contain heat. This heat is sourced from the sun and is reflected back towards the atmosphere. Certain gases are responsible for this entrapment and they include carbon dioxide, nitrous oxide, methane, fluorinated compounds and water vapor. Other man-made chemicals are also capable of retaining heat within the atmosphere.
In itself, the greenhouse effect is not essentially evil. In fact, it is this very phenomenon that has produced life on earth as we know it. Think of the greenhouse effect as a natural thermal blanketing for our planet, maintaining a surface temperature that is just right to encourage organisms to grow and survive. Without this blanketing, the earth’s climate would be too cold – about 59F lower than the average – for our planet to be able to sustain life successfully.
How does the greenhouse effect contribute to global warming?
For more than 4 billion years, the greenhouse effect has kept our planet’s temperature at a friendly level. Gases found in the atmosphere act to trap heat and keep our planet insulated, able to sustain itself. Problems only began to arise when scientists noticed that certain practices and human activities contribute to the modification of this process.
When the Industrial Revolution began, we also devised many ways of using fossil fuel for oil, coal and gas. The only way to utilize these fuels was by burning. As industrialization continued to expand, so did the practice of fossil fuel burning, thereby releasing gases into the atmosphere. The only problem was that these gases had nowhere else to go and have continued to build up over the years.
By building up, they cause the atmosphere to become more efficient in trapping heat, causing climates to turn warmer. This unnatural or man-made result is referred to as global warming.
How global warming affects us
We have been experiencing the effects of global warming for the past years and most of these are felt through changes in the climate. However, it’s important to note that climate change is brought about by other factors and not just as an indirect result of the greenhouse effect. Some of these factors include changes in the circulation of the oceans, changes in our planet’s orbit and even changes in the intensity of the sun itself.
Global warming involves increase in the average temperature of the earth’s atmosphere near its surface. While global warming is nothing new to our planet (it has occurred over long periods in the earth’s 4.5-billion-year history alternating with ice ages), it is only now when its drastic changes on a global scale has dire consequences not just for human kind but also to the millions of species that depend upon the earth for sustenance.
A famous example of the effect of global warming is the increase in sea level, brought about by the melting of glaciers. This is a problem not readily seen nor felt in countries or regions that lie on higher ground, but for many areas, this could mean land (and subsistence opportunities) lost to sea. A 0.3-meter increase in sea level for example, can eat up about 15 meters of beach.
As temperatures rise, countries that have agricultural practices firmly dependent on the regularity of glacier-melting will suffer greatly. For many regions in the world, the melting of snowpacks from the mountains means water for plant irrigation and electricity. If the melting occurs at a bad time, the planting and harvesting of crops will be significantly disrupted, causing problems in the economy on a local and national level.
With global warming, abrupt weather changes may also be experienced, such as heat waves that last longer and occur with more frequency, stronger storms and hurricanes and even changes in the behavior of the winds. Warmer climate will also contribute to the displacement of plants and animals, as those who depend upon lower temperature regions to survive will need to move to higher elevations and latitudes. For plants and animals who cannot adapt, it could mean extinction.
Healthwise, diseases that right now are currently limited by the location and living habits of their carriers have the possibility of invading areas that didn’t have a problem with them before. An example of this is malaria, along with other diseases caused by mosquitoes.
Mosquitoes thrive in tropical settings and as more and more regions become warmer, mosquitoes will expand their range. They will now be able to go to areas that they usually do not inhabit because of the temperature. This exposes the formerly unexposed population to the health risks caused by mosquito-borne diseases that also include dengue and elephantiasis.
Author: Kenneth Sondin
There has been much discussion, both among experts and lay people, about the ‘greenhouse effect.’ The greenhouse effect is a term that refers to changes in the Earth’s atmospheric composition, which have been related to the warming of our planet. There is a growing amount of evidence that human activities, particularly those relating to the burning of fossil fuels like oil and coal, are major contributors to the greenhouse effect. The predicted consequences for the planet as a result of the greenhouse effect are extremely serious. They include major changes in the climate that will have an impact on food production and rising sea levels, which will put many coastal and other low-lying communities under water.
Additional information that we have learned about the planet Venus provide a frightening example of the greenhouse effect. Venus has a very dense atmosphere made up of gases. The planet has what has been described as a ‘runaway greenhouse effect.’ It has surface temperature of about 800 degrees Fahrenheit.
Experts generally point to gases like carbon dioxide as the main contributors to the greenhouse effect. Carbon dioxide, which is a gas that is exhaled by everyone, can absorb infrared radiation. This type of radiation is heat that is radiating away from a warm object. During the day, the Earth is warmed by sunlight, and at night, the Earth cools off by radiating the heat back into space in the form of infrared radiation. Carbon dioxide, and other gases to some extent, absorb this radiation and limit its exit into space. Therefore, the natural cooling mechanism is thwarted.
While it may seem that eliminating the greenhouse effect would be the best strategy, this is not what we want to do. Water vapor represents another element in the heat-absorbing process. There is a great amount of water vapor in the atmosphere at all times. This is why we experience rain. We need the water vapor in the atmosphere to keep the Earth at its normal, comfortable temperature. Without the warmth created by water vapor, the planet would freeze, and that would be the end of life as we know it. Therefore, we need to have some degree of the ‘greenhouse effect’ in order to maintain life on Earth.