Artikel Global Warming

Global Warming

Global Warming is the increase in the average temperature of the atmosphere, ocean, and land Earth.

Global average temperature at Earth's surface has increased by 0.74 ° C ± 0:18 (1:33 ± 0:32 ° F) over the last hundred years.  Intergovernmental Panel on Climate Change (IPCC) concluded that, "the majority of the increase in global average temperatures since the mid-20th century, most likely caused by increased concentrations of greenhouse gases due to human activities" [1] through the greenhouse effect. These basic conclusions have been put forward by at least 30 scientific and academic bodies, including all national science academies of the G8 countries. However, there are still some scientists who do not agree with some of the conclusions of the IPCC stated.

Climate models referenced by the IPCC project shows global surface temperature will increase by 1.1 to 6.4 ° C (2.0 to 11.5 ° F) between 1990 and 2100.Perbedaan guesstimate was caused by the use of different scenarios on the emissions of greenhouse gases in the future, as well as models with differing climate sensitivity. Although most research has focused on the period up to 2100, warming and sea level rise is expected to continue for more than a thousand years even if greenhouse gas emission levels stabilize reflects the large heat capacity of the oceans.

Increasing global temperature will cause changes such as rising sea levels, increased intensity of extreme weather phenomena, as well as changes in the amount and pattern of precipitation. Consequences of global warming include its impact on agricultural output, loss of glaciers and the extinction of various animal species.

Global warming is a process of increasing the average temperature of the atmosphere, ocean, and land Earth.

Global average temperature at Earth's surface has increased by 0.74 ° C ± 0:18 (1:33 ± 0:32 ° F) over the last hundred years. Intergovernmental Panel on Climate Change (IPCC) concluded that, "the majority of the increase in global average temperatures since the mid-20th century, most likely caused by increased concentrations of greenhouse gases due to human activities" [1] through the greenhouse effect. These basic conclusions have been put forward by at least 30 scientific and academic bodies, including all national science academies of the G8 countries. However, there are still some scientists who do not agree with some of the conclusions of the IPCC stated.

Climate models referenced by the IPCC project shows global surface temperature will increase by 1.1 to 6.4 ° C (2.0 to 11.5 ° F) between 1990 and 2100. [1] The difference in estimates was caused by the use of different scenarios on the emissions of gas- greenhouse gases in the future, as well as models with differing climate sensitivity. Although most research has focused on the period up to 2100, warming and sea level rise is expected to continue for more than a thousand years even if greenhouse gas emission levels have stabilized. [1] This reflects the large heat capacity of the oceans.

Increasing global temperature will cause changes such as rising sea levels, increased intensity of extreme weather phenomena, [2] as well as changes in the amount and pattern of precipitation. Consequences of global warming include its impact on agricultural output, loss of glaciers and the extinction of various animal species.

Some things that scientists are still in doubt about the amount of warming expected to occur in the future, and how warming and changes that occur will vary from one region to another. Up to now there is still political and public debate in the world about what, if any, action should be taken to reduce or reverse the further warming or to adapt to the consequences there. Most governments in the world have signed and ratified the Kyoto Protocol, aimed at reducing emissions of greenhouse gases.

Causes of Global Warming

1. Efek Greenhouse

All energy sources that exist on Earth comes from the sun. Most of the energy in the form of short-wave radiation , including visible light . When this energy arrives surface of the Earth , he turned on the light into heat that warms the Earth . Earth 's surface will absorb some of the heat and reflect the rest . Some of this heat tangible long-wave infrared radiation into space . However, some heat remains trapped in the earth's atmosphere due to the accumulated amount of greenhouse gases include water vapor , carbon dioxide , sulfur dioxide and methane that become traps for this radiation . These gases absorb and reflect radiation emitted by the Earth and consequently the heat stored in the Earth's surface . This situation occurs continuously , resulting in an annual average temperature of the earth continues to increase .

2. Efek Feedback

nasir cause of global warming is also influenced by various feedback processes that result. An example is the evaporation of water. In the case of warming caused by greenhouse gases such as CO2, warming will initially cause greater volumes of water that evaporates into the atmosphere. Because water vapor is itself a greenhouse gas, warming will continue and increase the amount of water vapor in the air until it reaches equilibrium with the water vapor concentration. The resulting greenhouse effect greater than the effect of CO2 alone. (Although this feedback raises the absolute water content in the air, the relative humidity of the air is almost constant or even fall because the air becomes warm). [3] This feedback affects only slowly because of CO2 have longevity in the atmosphere. Another important feedback is the loss of reflectance (albedo) by ice. [4] As global temperatures rise, ice near the poles melts at an increasing rate. Along with melting ice, land or water below it will open. Both land and water has the ability to reflect light much less when compared to ice, and consequently will absorb more solar radiation. This will add to warming and causing even more ice to melt, causing a continuous cycle

Impact of Global Warming

Many very adverse impact generated and perceived by all living creatures on earth because of the golbal warming or global warming which is increasingly rising . As for the impacts to the lives of , among others :

The longer the temperature of the earth's surface will be more extreme .

Sea levels around the world will increase .

The intensity of hurricanes will increase.

Many droughts and crop failures worldwide .

There will be famine and drought earth .

Various diseases emerging due to global warming.

 The extinction of some species of living creatures .