Global warming has been at issue for several years over the world. In mass media, almost everyday the article of this problem has released. This is linked to environment as well as economies on the earth. In other words, it is involved with our lives. So, many scientists have studied on it and many countries have maintained the regulations to reduce the causes of the problem.
Green house gas is the most influencing factor on this problem. We call it green house effect. In the atmosphere, there are some elements called green house gas like water vapor, carbon dioxide, methane and ozone. Among them, water vapor has been the biggest part of this effect-about 36~70%. Although methane is more effective than CO2, CO2 is more influenced on it because of the amount of CO2 in air. As green gas is preventing from releasing the heat to out of the earth, the temperature has kept rising.
Feed backs and solar variation are also some of the reason of this problem. Feed back is related to the evaporation of water. At first, long lived green house gas CO2 is generated by used fossil fuels. Then, the temperature is getting high by CO2 addition to air. Finally, which has leaded to an increase in the absolute moisture contents of air.
Sun may have contributed about 45~50% of the increase in the temperature. As solar activities have been active, it would be warming of most of the stratosphere. Then, the variations in solar have contributed to recent warming. But, this effect is far too small to contribute significantly to global warming comparing to other factors.
Global warming has been leading to serious problems like glacial retreat, the increase in sea level, extreme weather events, species extinctions and emerging disease. Now, the climate has remarkably changed. It is getting harder that we expect the weather by changing patterns like flooding and drought. Because of extreme weather events, the amount of damage has been increasing over the world.
Global warming is also closed connected with population, especially the area of Asia. In Asia, these countries have a great deal of population. Because of the much high density of population in Asia, the amount of green house gas made is usually more than other countries. There are also developing countries such as China and India, so the influence of Asia could be enormous. As these countries have used a number of fossil fuels to grow in economy, the opinions that developing countries should more consider the way to develop environmentally have been stronger.
Many countries have maden efforts to reduce the damages in environment and in economy. Scientists have studied on the effective way to use fossil fuels and developing the alternative energy. In Kyoto protocol, there is regulation of emission of CO2. Also, over the world, ETS(Emission Trading Scheme) was emerging to sell the right of emission of CO2
