Global Warming

Global Warming is the process of increasing the average temperature of the atmosphere, ocean, and the Earth's land.

Global average temperature at Earth's surface has increased by 0.74 ° C ± 0:18 (1:33 ± 0:32 ° F) during the last hundred years. Intergovernmental Panel on Climate Change (IPCC) concluded that "most 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" through the greenhouse effect. These basic conclusions have been advanced by at least 30 scientific and academic bodies, including all the national science academies of the G8 nations. However, there are still some scientists who disagree with some of the IPCC conclusions are presented.


Climate models project that was used as reference by the IPCC shows global surface temperature will rise 1.1 to 6.4 ° C (2.0 to 11.5 ° F) between 1990 and 2100. Guesstimate the difference was caused by using different scenarios of emissions of greenhouse gases in the future, as well as models of different climate sensitivities. Although most research is 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 been stable. This reflects the large heat capacity of the oceans.


Increasing global temperatures are expected to lead to other changes such as rising sea levels, increased intensity of extreme weather phenomena, as well as changes in the number and pattern of precipitation. Consequences of global warming are another character of agricultural output, loss of glaciers, and the extinction of various animal species.

Some of the things that scientists are still doubtful about the amount of warming predicted to occur in the future, and how warming and the changes that happen will vary from one region to another. Until now there is still political and public debate in the world about what, if any, action needs to be done to reduce or reverse further warming or to adapt to the consequences of the existing. Most governments of the world's countries have signed and ratified the Kyoto Protocol, which leads to a reduction in emissions of greenhouse gases.


Greenhouse Effect

All sources of energy contained in the Earth comes from the sun. Most of the energy in the form of short wave radiation, including [visible light]. When this energy reached Earth's surface, he changed from light into heat that warms the Earth. Earth's surface, will absorb some of the heat and reflecting back the rest. Some of this heat radiation tangible [infrared] long waves into outer space. But some of the heat remains trapped in the earth's atmosphere due to deposition of [[greenhouse gas]], among others, [water vapor], [carbon dioxide], and [methane] who became a trap this radiation waves. These gases absorb and reflect back the radiation waves emitted by the Earth and consequently the heat is stored in the Earth's surface. This situation occurs continuously resulting in an annual average temperature of [Earth] continue to increase.

Gases such as gas works in the [greenhouse]. With the increasing concentration of these gases in the atmosphere, the more heat is trapped underneath.

The greenhouse effect is very much needed by all living things on earth, because without it, this planet will become very cold. With an average temperature of 15 ° C (59 ° F), the earth actually has more hot 33 ° C (59 ° F) from the initial temperature, if there is no greenhouse effect the earth temperature is -18 ° C only so the ice will cover the entire surface of the Earth. But on the contrary, if the gases in the atmosphere has been excessive, will cause global warming.