An informative essay contains three parts. The first part is the introduction. It is used to grab the attention of the reader and introduce the present topic. The second part is the bulk of the essay and contains all of the important facts being covered. The last part is the conclusion.
Global Warming is the increase of Earth's average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth. This is a type of greenhouse effect.
The greenhouse effect is not the same as global warming. Global warming refers to the increase in global average temperature due to excessive amounts of greenhouse gases. The greenhouse effect describes a critical function of our atmosphere: to keep the earth warm enough to sustain life.