exam question 5 the greenhouse effect

The greenhouse effect is a natural occurance that has been happening for ages. The greenhouse effect is the process in which the emission of infrared radiation by an atmosphere warms a planet's surface. (http://en.wikipedia.org/wiki/Greenhouse_effect) This means that as the suns rays hit the earth and reflect back, heading toward space, gases in the atmosphere help to hold some of the suns heat close to the earth. Without the greenhouse effect, the earth would be significantly cooler (by as much as 30°C!). (http://en.wikipedia.org/wiki/Greenhouse_effect)
In recent years, people have been becoming more and more concerned about the increase in global temperature. This is due to a factor known as global warming. Global warming is the process by which human activity causes more than adequate amounts of greenhouse gases (mainly CO2) to be released into the atmosphere. Because of this, more heat from the sun is being retained next to the earth causing increased global temperatures.
Since the year 1860, the average earth surface temperature has increased by about 1°C. If some sort of actions are not taken soon, then by the year 2100 A.D. the average global temperature could be increased by as much as 1°C more!
Such drastic changes in global temperature could completely throw off many of the worlds ecosystems. Increased temperature would cause increased evaporation of many of the earth's bodies of water. This would lead to the environment of many seafaring animals to be destroyed. Increased temperatures would also cause increased algae growth (algal bloom) which would further harm the marine wildlife.
It is my belief that some sort of action must be taken to reduce GHG (greenhouse gas) emission and salvage our earth before it is too late. In order to support the core democratic value of common good, people should try to be more environmentally friendly. If we all pitch in and help to cut back on activities harmful to the environment, we will be able to preserve our world for future generations.