The Greenhouse Effect is a natural warming process. Carbon dioxide (CO2) and certain other gases are always present in the atmosphere. These gases create a warming effect that has some similarity to the warming inside a greenhouse, hence the name “Greenhouse effect.” Increasing the amount of greenhouse gases intensifies the greenhouse effect. Higher concentrations of CO2 and other greenhouse gases trap more infrared energy in the atmosphere than occurs naturally. The additional heat further warms the atmosphere and Earth’s surface.

The Earth is largely a closed system, meaning that it exchanges very little matter with its external environment in space, but the same is not true of the systems within the planet—geosphere, hydrosphere, biosphere, and atmosphere—which interact to such a degree that they are virtually inseparable. Together these systems constitute an intricate balance, a complex series of interrelations in which events in one sector exert a profound impact on conditions in another. Read more: http://www.answers.com/topic/earth-system#ixzz1XooYpPEL

Google them!

It is too hard to learn earth system function, greenhouse effect and english all at the same time. Why don't you use google for the first and second matters and italki for the third? Just a suggestion... Two links for your questions, good luck: http://oceanworld.tamu.edu/resources/oceanography-book/earthsystems.htm http://en.wikipedia.org/wiki/Greenhouse_effect