"GLOBAL+WARMING - Google Search." GLOBAL+WARMING - Google Search. N.p., n.d. Web. 25 Apr. 2015

The above picture shows the difference between enhanced and natural green house effects. In the natural green house effect most of the green house gases would escape the atmosphere maintaining the balance. However due to many reasons today these green house gases are unable to escape the atmosphere, resulting in higher temperatures, change in seasons and many more things.