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Edit Comment Close By: shut107 (30 month(s) ago) excellent presentation Saving..... Post Reply Close Saving..... Edit Comment Close By: 210187794 (30 month(s) ago) may i download this ppt for mydiscussion at school please. Saving..... Post Reply Close Saving..... Edit Comment Close loading.... See all Premium member Presentation Transcript Slide 1: GREEN HOUSE EFFECT MEANING OF GREEN HOUSE EFFECT : MEANING OF GREEN HOUSE EFFECT The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane, for example) trap energy from the sun. The Earth’s atmosphere is all around us. It is the air that we breathe. Greenhouse gases in the atmosphere behave much like the glass panes in a greenhouse. Sunlight enters the Earth's atmosphere, passing through the blanket of greenhouse gases. As it reaches the Earth's surface, land, water, and biosphere absorb the sunlight’s energy. Once absorbed, this energy is sent back into the atmosphere. Some of the energy passes back into space, but much of it remains trapped in the atmosphere by the greenhouse gases, causing our world to heat up. Without these gases, heat would escape back into space and Earth’s average temperature would be about 60ºF colder. Because of how they warm our world, these gases are referred to as GREEN HOUSE EFFECT. WHAT IS GREEN HOUSE? : WHAT IS GREEN HOUSE? Greenhouses work by trapping heat from the sun. The glass panels of the greenhouse let in light but keep heat from escaping. This causes the greenhouse to heat up, much like the inside of a car parked in sunlight, and keeps the plants warm enough to live in the winter.Most greenhouses look like a small glass house. Greenhouses are used to grow plants, especially in the winter. Greenhouses work by trapping heat from the sun. The glass panels of the greenhouse let in light but keep heat from escaping. This causes the greenhouse to heat up, much like the inside of a car parked in sunlight, and keeps the plants warm enough to live in the winter. Slide 4: GREEN HOUSE EFFECT AND GLOBAL WARMING It is the name given to an expected increase in the magnitude of the greenhouse effect, whereby the surface of the Earth will almost inevitably become hotter than it is now. Green house effect Global warming The greenhouse effect is the name applied to the process which causes the surface of the Earth to be warmer than it would have been in the absence of an atmosphere Factors affecting the heat trapping ability of a Greenhouse : Factors affecting the heat trapping ability of a Greenhouse CLOUDS the top of the cloud reflects sunlight back into space before it ever reaches earth. Depending on their altitude and optical properties, clouds either cool or warm the earth.. The whitewash on plant greenhouses has the same effect on a smaller scale. High-altitude, thinner clouds, such as cirrus clouds, absorb long wave radiation reflected from the earth's surface, causing increased warming. ALBEDO This surface albedo effect strongly influences the absorption of sunlight. Snow and ice cover are highly reflective, as are light-colored deserts. Large expanses of reflective surfaces can significantly reduce solar warming. Dark-colored land surfaces, in contrast, are strongly absorptive and contribute to warming. If global temperatures increase, snow and ice cover may shrink. The exposed darker surfaces underneath may absorb more solar radiation, causing further warming. The magnitude of the effect is currently a matter of serious scientific study and debate. Slide 6: FORESTED AREAS: Like the oceans, the interaction of forests and sunlight is complex. The amount of solar radiation absorbed by forest vegetation depends upon the type and color of vegetation, the time of year, and how well watered and healthy the plants are. In general, plants provide a dark surface, so you might expect high solar absorption. A significant fraction of the solar radiation is captured by the plants and used to make food through photosynthesis (and thus it doesn't re-radiate as heat); some of the energy is dissipated as water evaporates from plant leaves; and some is absorbed and distributed deep within the forest canopy. Oceans: From space, oceans look much different than adjacent land areas - they often appear darker, suggesting that they should be absorbing far more sunlight. But unlike dry land, water absorbs energy in a dynamic fashion. Some of the solar energy contacting the surface may be carried away by currents, some may go into producing water vapor, and some may penetrate the surface and be mixed meters deep into the water column. These factors combine to make the influence of the ocean surface an extremely complex and difficult phenomenon to predict. Slide 7: Chemicals- Avoid chlorine at all cost! Use of any chlorine compounds is very harmful to the environment including bubbles in plastic foam, spray paint, fire extinguishers, bleach and a multitude of discarded household and industrial chemicals. Phosphates found in many laundry detergents and soaps contributes to water pollution and should be avoided. Aresols such as air fresheners and hair sprays can contain butane/pentane which contributes to air pollution and should be avoided PREVENTION OF GREEN HOUSE EFFECT Appliances- It is very important to keep up on the maintenance of your refrigerator and air conditioners as they can leak very toxic and harmful chemicals. Furnace maintenance will help to reduce the amount of heat you need, thus reducing fossil fuel production. Waste and Recycling- It is very beneficial to use recycled paper or to use products that are manufactured from ecologically managed forests. According to Seventh Generation "if every household in the US replaced just one roll of 1000 sheets of toilet paper with recycled toilet paper, could save 373,000 trees, 1.48 million cubic feet of landfill space (equal to over 1682 full garbage trucks), 155 million gallons of water (a years supply for 4465 families of four) and avoid 62,000 pounds of pollution". Slide 8: Appliances- It is very important to keep up on the maintenance of your refrigerator and air conditioners as they can leak very toxic and harmful chemicals. Furnace maintenance will help to reduce the amount of heat you need, thus reducing fossil fuel production Home maintenance- Due to the harmful process of making fossil fuels, we should do what we can to reduce their production. Weatherstripping, insulation and proper ventilation will go along way to reducing the amount of heat your home needs. Use of cold water instead of hot will reduce the amount of energy needed, as well only running dishwashers and washing machines when full. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.