The environmental impact of aviation occurs because aircraft engines emit noise, and particulates and gases which contribute to climate change and global dimming.
Despite emission reductions from automobiles and more fuel-efficient and less polluting turbofan and turboprop engines, the rapid growth of air travel in recent years contributes to an increase in total pollution attributable to aviation.
In the European Union, greenhouse gas emissions from aviation increased by 87% between 1990 and 2006.
There is an ongoing debate about possible taxation of air travel and the inclusion of aviation in an emissions trading scheme, with a view to ensuring that the total external costs of aviation are taken int
Thursday, 6 March 2014
Greener Air Travel
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Global Warming
Global warming refers to an unequivocal and continuing rise in the average temperature of Earth's climate system.
Since 1971, 90% of the warming has occurred in the oceans.
Despite the oceans' dominant role in energy storage, the term "global warming" is also used to refer to increases in average temperature of the air and sea at Earth's surface.
Since the early 20th century, the global air and sea surface temperature has increased about 0.8 °C (1.4 °F), with about two-thirds of the increase occurring since 1980.
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Recycling
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Greenhouse Gas
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.
Greenhouse gases greatly affect the temperature of the Earth; without them, Earth's surface would average about 33 °C colder, which is about 59 °F below the present average of 14 °C (57 °F).
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Greenhouse Effect
The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions.
Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases.
Solar radiation at the frequencies of visible light largely passes through the atmosphere to warm the planetary surface, which then emits this energy at the lower frequencies of infrared thermal radiation.
Infrared radiation is absorbed by greenhouse gases, which in turn re-radiate much of the energy to the surface and lower atmosphere.
The mechanism is named after the effect of solar radiation passing through glass and warming a greenhouse, but the way it retains heat is fundamentally different as a greenhouse works by reducing airflow, isolating the warm air inside the structure so that heat is not lost by convection.
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Effects Of Global Warming
The effects of global warming are the ecological and social changes caused by the rise in global temperatures. There is a scientific consensus that climate change is occurring, and that human activities are the primary driver.
Evidence of climate change includes the instrumental temperature record, rising sea levels, and decreased snow cover in the Northern Hemisphere.
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Effects Of Recycling
The environmental problems of landfills is a difficult issue to fix. As more waste is put into landfills, the bigger the problem gets.
Products that are not biodegradable or are slow to decompose can remain in landfill sites for centuries, often emitting gases that could be harmful to the environment. Keeping paper out of landfills is just one way that recycling helps the environment.
Recycling items often uses less energy than manufacturing products from virgin sources. Making paper that is using recycled pulp, for instance, is much less energy intensive than using new wood.
While there are benefits to growing trees because of the carbon that they consume, this has to be offset against the damage that is done to the environment by putting paper in landfills and using energy to produce new items.
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