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Fossil Fuels
The twentieth century has been called the hydrocarbon century due to the abundance of fossil fuels, and their contribution to human development. Fossil fuels were formed over millions of years by the decomposing remains of plants and animals under immense heat and pressure. This process resulted in energy laden fuels coal, petroleum, and natural gas, which together have generated most of the energy consumed globally for over a century, paving the way for continued advancement and new inventions.
Fossil fuels are currently the most economically available source of power for both personal and commercial uses. Petroleum fuels our cars and thirst for plastics, while natural gas and coal heat and electrify our homes. Mass transportation is also largely propelled by fossil fuels. In 2005, more than 3/4 of total world energy consumption was through the use of fossil fuels. Petroleum led with over 43.4 percent of the world’s total energy consumption, followed by natural gas (15.6 percent) and coal (8.3 percent). North America is the largest consumer of fossil fuels, utilizing nearly 25 percent of the world’s resources.
Long thought to be inexhaustible, fossil fuels have been used extensively since the Industrial Revolution. However, many believe that the world is using fossil fuels at an unsustainable rate. Some experts believe that the world has already reached its peak for oil extraction and production, and that it is only a matter of time before natural gas and coal follow suit. These near-term concerns about oil supply have led to increasing focus on, and exploration of, alternative sources of petroleum, such as in tar sands and oil shale.
To release their stored energy, fossil fuels must be burned. It is during this combustion process that a variety of emissions and particulates, including ash, are released into the atmosphere. Primary releases are sulfur, nitrogen, and carbon, which can be harmful to the environment. They can combine with water vapor in the air to form acidic compounds that create acid rain, and burning fossil fuels releases carbon dioxide, a greenhouse gas that scientists believe is key factor in global climate change.
There are also environmental risks associated with extracting, transporting, and utilizing fossil fuels. Mining for coal and drilling for oil are especially hazardous because the digging of massive mines and wells can change the surrounding landscapes and bring massive amounts of salt water to the surface which can damage nearby ecosystems without proper treatment and sequestration. Natural gas extraction is somewhat safer, but can also be hazardous. While there are regulations in place that attempts to minimize the risks, it is impossible to eliminate them completely. However, regulation is not sufficient; there must be continued research in developing new technologies for both fossil fuel and renewable energy, in addition to increasing conservation measures.
Environmental Literacy Council
http://www.enviroliteracy.org/subcategory.php/21.html, access on March 14th, 2010.not valid statement found
In “The twentieth century has been called the hydrocarbon century due to the abundance of fossil fuels, and their contribution to human development.” (lines 1-3), ‘due to’ can be substituted by
Fossil Fuels
The twentieth century has been called the hydrocarbon century due to the abundance of fossil fuels, and their contribution to human development. Fossil fuels were formed over millions of years by the decomposing remains of plants and animals under immense heat and pressure. This process resulted in energy laden fuels coal, petroleum, and natural gas, which together have generated most of the energy consumed globally for over a century, paving the way for continued advancement and new inventions.
Fossil fuels are currently the most economically available source of power for both personal and commercial uses. Petroleum fuels our cars and thirst for plastics, while natural gas and coal heat and electrify our homes. Mass transportation is also largely propelled by fossil fuels. In 2005, more than 3/4 of total world energy consumption was through the use of fossil fuels. Petroleum led with over 43.4 percent of the world’s total energy consumption, followed by natural gas (15.6 percent) and coal (8.3 percent). North America is the largest consumer of fossil fuels, utilizing nearly 25 percent of the world’s resources.
Long thought to be inexhaustible, fossil fuels have been used extensively since the Industrial Revolution. However, many believe that the world is using fossil fuels at an unsustainable rate. Some experts believe that the world has already reached its peak for oil extraction and production, and that it is only a matter of time before natural gas and coal follow suit. These near-term concerns about oil supply have led to increasing focus on, and exploration of, alternative sources of petroleum, such as in tar sands and oil shale.
To release their stored energy, fossil fuels must be burned. It is during this combustion process that a variety of emissions and particulates, including ash, are released into the atmosphere. Primary releases are sulfur, nitrogen, and carbon, which can be harmful to the environment. They can combine with water vapor in the air to form acidic compounds that create acid rain, and burning fossil fuels releases carbon dioxide, a greenhouse gas that scientists believe is key factor in global climate change.
There are also environmental risks associated with extracting, transporting, and utilizing fossil fuels. Mining for coal and drilling for oil are especially hazardous because the digging of massive mines and wells can change the surrounding landscapes and bring massive amounts of salt water to the surface which can damage nearby ecosystems without proper treatment and sequestration. Natural gas extraction is somewhat safer, but can also be hazardous. While there are regulations in place that attempts to minimize the risks, it is impossible to eliminate them completely. However, regulation is not sufficient; there must be continued research in developing new technologies for both fossil fuel and renewable energy, in addition to increasing conservation measures.
Environmental Literacy Council
http://www.enviroliteracy.org/subcategory.php/21.html, access on March 14th, 2010.not valid statement found
The text “Fossil fuels” can be classified as a
Observe o período:
Não vejo em qualquer pessoa o menor mal-estar ou conflito em estar só.
O plural do período acima, realizado de acordo com o registro culto e formal da língua e sem alteração do sentido, é
Em cada um dos trechos abaixo, analise o deslocamento do pronome oblíquo.
I – “...que vai me levar... (l. 3) – que vai levar-me
II – “Eu me explico:” (l. 20) – Eu explico-me
III – “Ninguém se lembra...” (l. 55) – Ninguém lembra-se
IV – “Pouco se lixam...” (l. 57) – Pouco lixam-se
V – “...sente-se constrangido...” (l. 75) – se sente constrangido
VI – “...que se mudem!” (l. 79) – que mudem-se
Conforme o registro culto e formal da língua está correto APENAS o que ocorre em
As palavras em destaque que, em duas ocorrências no texto, mantêm a mesma classe e o mesmo significado são
A sentença “Pouco se lixam...” (l. 57) indica que a atitude das pessoas foi:
O uso que o autor faz da palavra e no trecho “...companheiros de jornada e de saguão...” (l. 24-25) é o mesmo em
Quanto à estrutura do texto, o autor
Os trechos transcritos abaixo reforçam o aspecto central do texto focalizado pelo autor. A única EXCEÇÃO é
Qual a frase em que a palavra em destaque apresenta o mesmo sentido de apropriado no trecho “...apropriado por alguns...” (l. 41)?
A comparação entre as pessoas no saguão e os “...velhos nobres ou bispos baianos da boa era escravocrata,” (l. 26-27) se baseia na seguinte atitude:
De acordo com o texto, o que “...nós, na nossa solene arrogância, abominamos –” (l. 9-10) é
P - Abordagem Q - Perspectiva R - Finalidade
( ) intervenção ( ) enquadramento ( ) produto ( ) concepção ( ) remanejamento ( ) produção
A classificação correta, de cima para baixo, é
I - agente do acidente; II - condição ambiente de insegurança; III - fonte da lesão; IV- prejuízo material.
Estão corretos os elementos
Conheça nossos planos