Since know about climate science, scientists have studied that appeared in Earth's climate is always changing. From the study of ice time in the past show that weather can change by itself, and changed drastically. What is it? Meteor fall? Variations hot sun? Mountain cloud burst which caused the smoke? Changes in wind direction due to changes in the structure of the Earth faces the sea and flow? Or because the composition of the air change? Or the other?
Until the 19th century on the new, the study on the climate began to know about the actual gas in the atmosphere, referred to as greenhouse gases, which can affect climate on Earth. What are greenhouse gases?
In fact that was known as' greenhouse gases', is an effect, where the molecule-molecule in the atmosphere we provide as a greenhouse effect. Greenhouse gases alone, should be the natural effect is to maintain the temperature at the Earth permukaaan normal temperature, about 30 ° C, or if not, then of course there will be no life in the face of this Earth.
In the years around 1820, found that fathers Fourier atmosphere that can be very diterobos (permeable) by the sun light into the surface of Earth, but not all the light that emanated to the surface of the Earth that can dipantulkan out, infra-red radiation, which should terpantul stuck, with the Therefore the Earth atmosphere trap heat (the principle greenhouse).
Thirty years later, Mr. Tyndall found that types of gases trap heat that is mainly carbon-dioxide and water vapor, and the molecule-molecule, which eventually was named as a greenhouse gas, as we know it now. Arrhenius and then show that if the concentration of carbon-dioxide dilipatgandakan, the increase in surface temperature to be very significant.
Since the discovery of Fourier, Tyndall and Arrhenius, the scientists understand how the greenhouse gases absorb radiation, allows to make a better calculation for the concentration of greenhouse gases and increasing temperatures. If the concentration of carbon-dioxide dilipatduakan only, then the temperature can be increased up to 1 ° C.
However, the atmosphere is not simply a model calculation, the fact is the increase of temperature can be more than 1 ° C due to factors such as, a course, change the number of clouds, reflection of heat between different land and sea, changes in moisture contents in the air, the surface changes Earth, either because of land clearing, changes in the surface, or causes the other, because the natural and human acts. Evidence indicates that there is, the atmosphere that have become more heat, the atmosphere with the store more moisture, and store more heat, warming strengthening of the standard calculation.
Since 2001, studies on global climate dynamics indicate that most do not, the world has experienced more warming of 3 ° C since the pre-industrial era, if only it can press the concentration of greenhouse gases so stable at 430 ppm CO2e (ppm = part per million = one million per ekivalen CO2 - which states the ratio of the amount of molecular gas CO2 per one million air dry). That, since 1900, the Earth has experienced warming of 0.7 ° C.
Then, if the heating occurs, as it is called, which was then known as global warming, (or a term popular in the English language, as we call Global Warming): Is a natural phenomenon that is not avoided? Or there is a reason that signfikan, so it became 'popular' like this now? Was it because Al Gore with the film "An Inconvenient Truth" that global warming popularize? Of course, not simply that.
Need to work together internationally to be able to say that the man who became the main cause of the occurrence of global warming. Reports IPCC (Intergovernmental Panel on Climate Change) in 2007, shows that the average global human activity since the 1750 cause of warming. Changes in abundance of greenhouse gases and aerosols due to sun radiation and the entire surface of the Earth affect the climate system's energy balance. In magnitude as Radiative Forcing as a means of measuring whether the global climate be hot or cold (red represent positive values or cause to be more warm, and of the blue), it was found that due to human activities-lah (antropogenik) which is the main supporter of a global warming