Outline :p

I. Introduction
a. Slums are bad for people.
b. Introduce to the reader what a slum is.
c. Slums occur all over the world, they cause poverty, global warming and diseases.
d. Transitional to the first paragraph.
II. Defendable Point #1
a. One causes of slum is poverty.
b. People are poor so they end up living in the slums.
i. qoute
ii. paraphrase
c. Explanation
d. Transition sentence to the next.
III. Defendable Point #1
a. One causes of slum is global warming.
b. people who live in slums cause global warming.
i.quote
ii. paraphrase
c. Explanation
d. Transition sentence to the next paragraph.
IV. Defendable Point #1
a. Another causes of slums are global warming.
b. people who live in slums cause global warming.
c. Explanation
d. Transition sentence to the next paragraph.
V. Conclusion
a. Hook
b. Slums occur all over the world, they cause poverty, global warming and diseases.
c. Summarize arguments
d. Leave the reader something to think about.