In physics and other sciences, energy (from the Greek ενεργός, energos, "active, working") is a scalar physical quantity that is a property of objects and systems which is conserved by nature. Energy is often defined as the ability to do work. [ http://en.wikipedia.org/wiki/Energy ]
In society and in the context of humanities, the word energy is used as a synonym of energy resources, and most often refers to substances like fuels, petroleum products and electricity in general. These are sources of usable energy, in that they can be easily transformed to other kinds of energy sources that can serve a particular useful purpose.
In society and in the context of humanities, the word energy is used as a synonym of energy resources, and most often refers to substances like fuels, petroleum products and electricity in general. These are sources of usable energy, in that they can be easily transformed to other kinds of energy sources that can serve a particular useful purpose.
Renewable energy effectively uses natural resources such as sunlight, wind, rain, tides and geothermal heat, which are naturally replenished. Renewable energy technologies range from solar power, wind power, hydroelectricity/micro hydro, biomass and biofuels for transportation.
In 2006, about 18 percent of global final energy consumption came from renewables, with 13% coming from traditional biomass, like wood-burning. Hydropower was the next largest renewable source, providing 3%, followed by hot water/heating which contributed 1.3%. Modern technologies, such as geothermal, wind, solar, and ocean energy together provided some 0.8% of final energy consumption.
[ http://en.wikipedia.org/wiki/Renewable_energy ]
In 2006, about 18 percent of global final energy consumption came from renewables, with 13% coming from traditional biomass, like wood-burning. Hydropower was the next largest renewable source, providing 3%, followed by hot water/heating which contributed 1.3%. Modern technologies, such as geothermal, wind, solar, and ocean energy together provided some 0.8% of final energy consumption.
[ http://en.wikipedia.org/wiki/Renewable_energy ]
The Long Term Growth Prospects
of the World Economy, by Sandra Poncet -
http://www.cepii.fr/anglaisgraph/workpap/pdf/2006/wp06-16.pdf
of the World Economy, by Sandra Poncet -
http://www.cepii.fr/anglaisgraph/workpap/pdf/2006/wp06-16.pdf
Goldman Sachs (2003) analysis -
http://everything2.com/index.pl?node_id=1756826
http://everything2.com/index.pl?node_id=1756826
Occurrences of the phrase 'sustainable energy'
1997: 0
1998: 0
1999: 4
2000: 2
2001: 1
2002: 11
2003: 20
2004: 15
2005: 28
2006: 34
2007: 29
[source: BBC News Online archives, http://news.bbc.co.uk ]
1997: 0
1998: 0
1999: 4
2000: 2
2001: 1
2002: 11
2003: 20
2004: 15
2005: 28
2006: 34
2007: 29
[source: BBC News Online archives, http://news.bbc.co.uk ]
Occurrences of the phrase 'renewable energy'
1997: 0
1998: 0
1999: 0
2000: 0
2001: 10
2002: 98
2003: 108
2004: 141
2005: 236
2006: 291
2007: 290
[source: BBC News Online archives, http://news.bbc.co.uk ]
1997: 0
1998: 0
1999: 0
2000: 0
2001: 10
2002: 98
2003: 108
2004: 141
2005: 236
2006: 291
2007: 290
[source: BBC News Online archives, http://news.bbc.co.uk ]
Occurrences of the phrase 'solar power'
1997: 2
1998: 3
1999: 8
2000: 11
2001: 22
2002: 19
2003: 35
2004: 28
2005: 42
2006: 40
2007: 46
[source: BBC News Online archives, http://news.bbc.co.uk ]
1997: 2
1998: 3
1999: 8
2000: 11
2001: 22
2002: 19
2003: 35
2004: 28
2005: 42
2006: 40
2007: 46
[source: BBC News Online archives, http://news.bbc.co.uk ]
Geothermal power (from the Greek words geo, meaning earth, and therme, meaning heat) is energy generated by heat stored beneath the Earth's surface or the collection of absorbed heat in the atmosphere and oceans. Prince Piero Ginori Conti tested the first geothermal generator on 4 July 1904, at the Larderello dry steam field in Italy. The largest group of geothermal power plants in the world is located in The Geysers, a geothermal field in California. As of 2007, geothermal power supplies less than 1% of the world's energy.
[ http://en.wikipedia.org/wiki/Geothermal_power ]
[ http://en.wikipedia.org/wiki/Geothermal_power ]
Wind power is the conversion of wind energy into useful form, such as electricity, using wind turbines. In windmills, wind energy is directly used to crush grain or to pump water. At the end of 2007, worldwide capacity of wind-powered generators was 94.1 gigawatts. Although wind currently produces just over 1% of world-wide electricity use, it accounts for approximately 19% of electricity production in Denmark, 9% in Spain and Portugal, and 6% in Germany and the Republic of Ireland (2007 data). Globally, wind power generation increased more than fivefold between 2000 and 2007.
[ http://en.wikipedia.org/wiki/Wind_power ]
[ http://en.wikipedia.org/wiki/Wind_power ]
Hydroelectricity is produced by hydropower. It is a renewable source of energy, produces no waste, and does not produce carbon dioxide (CO2) which contributes to greenhouse gases. Hydroelectricity now supplies about 715,000 MWe or 19% of world electricity (16% in 2003), accounting for over 63% of the total electricity from renewables in 2005.
Although large hydroelectric installations generate most of the world's hydroelectricity, small hydro schemes are particularly popular in China, which has over 50% of world small hydro capacity.
[ http://en.wikipedia.org/wiki/Hydroelectric ]
Although large hydroelectric installations generate most of the world's hydroelectricity, small hydro schemes are particularly popular in China, which has over 50% of world small hydro capacity.
[ http://en.wikipedia.org/wiki/Hydroelectric ]
A solar cell or photovoltaic cell is a device that converts light into electricity using the photoelectric effect. The first working solar cells were constructed by Charles Fritts in 1883.
Photovoltaics, or PV for short, is a technology that converts light directly into electricity. The manufacture of solar cells and solar photovoltaic array has expanded dramatically in recent years. Photovoltaic production has been doubling every two years, increasing by an average of 48 percent each year since 2002, making it the world’s fastest-growing energy technology. At the end of 2007, according to preliminary data, cumulative global production was 12,400 megawatts. Solar photovoltaics provided 0.04% of the world's energy usage in 2004
[ http://en.wikipedia.org/wiki/Solar_power and http://en.wikipedia.org/wiki/Solar_photovoltaics ]
Photovoltaics, or PV for short, is a technology that converts light directly into electricity. The manufacture of solar cells and solar photovoltaic array has expanded dramatically in recent years. Photovoltaic production has been doubling every two years, increasing by an average of 48 percent each year since 2002, making it the world’s fastest-growing energy technology. At the end of 2007, according to preliminary data, cumulative global production was 12,400 megawatts. Solar photovoltaics provided 0.04% of the world's energy usage in 2004
[ http://en.wikipedia.org/wiki/Solar_power and http://en.wikipedia.org/wiki/Solar_photovoltaics ]
http://news.bbc.co.uk/1/hi/sci/tech/7340528.stm
The Bahrain World Trade Centre is believed to be the world's first wind-powered mega structure. It has three huge blades incorporated at the centre of its design.
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