Presentation on theme: "Greenhouses and and the green house effects"— Presentation transcript:
1Greenhouses and and the green house effects Done by:Ilham Hassanali10 CRoyal College
2CONTENTS IN THIS PRESENTATION What is the green house?Pictures of green houses.What is the green house effect means?What are the green house effects?Diagrams showing the green house effects.Role in climate change.Global warming.Steps that can be taken to minimize effects.Causes to the green house effect.
3What is the green house?A greenhouse (also called a glasshouse) is a building where plants are grown.A greenhouse is a structure with a glass or plastic roof and frequently glass or plastic walls; it heats up because incoming visible solar radiation from the sun is absorbed by plants, soil, and other things inside the building.This picture shows a lovely green grassland.
4The warmed structures and plants inside the greenhouse re-radiate this energy in the infra-red, to which glass is opaque, and that energy is trapped inside the glasshouse.Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall.These structures range in size from small sheds to very large buildings.
5Greenhouses can be divided into glass greenhouses and plastic greenhouses.
7What does the green house effect means? The greenhouse effect is a process by which radiative energy leaving a planetary surface is absorbed by some atmospheric gases, called greenhouse gases.The greenhouse effect was discovered by Joseph Fourier in 1824, first reliably experimented on by John Tyndall in 1858, and first reported quantitatively by Svante Arrhenius in 1896.
8What are the green house effects? The greenhouse effect is important. Without the greenhouse effect, the Earth would not be warm enough for humans to live. But if the greenhouse effect becomes stronger, it could make the Earth warmer than usual. Even a little extra warming may cause problems for humans, plants, and animals.
11Role in climate change.Strengthening of the greenhouse effect through human activities is known as the enhanced (or anthropogenic) greenhouse effect.This increase in radiative forcing from human activity is attributable mainly to increased atmospheric carbon dioxide levels.[CO2 is produced by fossil fuel burning and other activities such as cement production and tropical deforestation.Measurements of CO2 from the Mauna Loa observatory show that concentrations have increased from about 313 ppm in 1960 to about 389 ppm in The current observed amount of CO2 exceeds the geological record maxima (~300 ppm) from ice core data.The effect of combustion-produced carbon dioxide on the global climate, a special case of the greenhouse effect first described in 1896 by Svante Arrhenius, has also been called the Callendar effect.
12Because it is a greenhouse gas, elevated CO2 levels contribute to additional absorption and emission of thermal infrared in the atmosphere, which produce net warming. According to the latest Assessment Report from the Intergovernmental Panel on Climate Change, "most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations".Over the past 800,000 years,ice core data shows unambiguously that carbon dioxide has varied from values as low as 180 parts per million (ppm) to the pre-industrial level of 270ppm.Paleoclimatologists consider variations in carbon dioxide to be a fundamental factor in controlling climate variations over this time scale.[
13Global warming.Global warming is the increase in the average temperature of Earth's near-surface air and oceans since the mid-20th century and its projected continuation.According to the 2007 Fourth Assessment Report by the Intergovernmental Panel on Climate Change (IPCC), global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 20th century.
15Causes to the green house effect. Humankind has progressed a lot over the years. However, this progress has come at a cost of the exploitation of nature many a times. Humans are the main reason for the pollution in nature.Global warming has been a matter of concern for many years, with various man-made machines now contributing to Global Warming.One of the main causes of Global Warming is the Green house effect. When the emission of infra-red radiation in the atmosphere warms a planet's surface, it is known as the Green House Effect. The Greenhouse effect is a natural phenomena occurring on planet Earth.There are natural as well as human-made causes of the greenhouse effect. The natural causes of the Green house effect are the emissions of gases like nitrous oxide, carbon-di-oxide, methane, ozone and water vapour.
16The greenhouse effect is actually beneficial to the Earth The greenhouse effect is actually beneficial to the Earth. It is only when human-made processes increase its speed that the problems occur. One main problem is the oft repeated 'Global Warming'.One of the man-made causes of the Green House effect is deforestation. Deforestation increases the amount of carbon-di-oxide in the atmosphere. Also, due to the disappearance of trees, photosynthesis cannot take place. Deforestation causes of the greenhouse effect. Deforestation is rampant today due to the increase in human civilization. The levels of deforestation have increased by about nine percent in recent times. Also, the burning of wood causes it to decay, therefore releasing more carbon-dioxide into the atmosphere.Greenhouse Gases also can be released into the atmosphere due to the burning of fossil fuels, oil, coal and gas. These materials are used increasingly and rampantly in Industries. Therefore Industries are also a major cause of the Greenhouse Effect.
17Another man-made causes of the increase in the Green house effect due to the emission of such gases are any all electrical appliances. Even the humble refrigerator in the house emits gases which contribute to the Greenhouse effect. These gases are known as Chloroflourocarbons (CFCs) and are used in refrigerators, aerosol cans, some foaming agents in the packaging industry, fire extinguisher chemicals and cleaners used in the electronic industry. Some processes of the cement manufacturing industries also act as a cause towards the Greenhouse effect. Other man-made processes that contribute and are a cause to the Greenhouse effect are burning of gasoline, oil and coal. Apart from these, some farming and land-use processes are a cause of the Green house effect. Most factories also produce many gases which last for a longer time in the atmosphere. These gases contribute to the green-house effect and also the global warming on the planet. These gases are not naturally available in the atmosphere.
18Population growth also is a indirect contributer and one of the causes of the Greenhouse effect. With the increase in population, the needs and wants of the people increase. Therefore, this increases the manufacturing processes as well as the industry processes. This results in the increase of the release of industrial gases which catalyse the green house effect. The increase in population also results in the increase of agricultural processes. Most man-made machines, like the automobile also contribute to the green house effect.
19. Steps that can be taken to minimize effects Reducing the amount of future climate change is called mitigation of climate change. The IPCC defines mitigation as activities that reduce greenhouse gas (GHG) emissions, or enhance the capacity of carbon sinks to absorb GHGs from the atmosphere. Many countries, both developing and developed, are aiming to use cleaner, less polluting, technologies. Use of these technologies aids mitigation and could result in substantial reductions in CO2 emissions. Policies include targets for emissions reductions, increased use of renewable energy, and increased energy efficiency. Studies indicate substantial potential for future reductions in emissions.
20“ Summary “Therefore we will take necessary steps to prevent from global warming and the effects of green houses.