Harmful human activities on global warming

I have already done my outline.If you follow my outline,I will appreciate.

Outline

I.Introduction (what global warming is,the history of global warming)
II.General Thoughts About Global Warming
III.Harmful Human Activities
A. Using Fossil Fuels
B. Deforestation
C. Over Population
IV.Possible Disasters and Solutions
V.Conclusion

It must have some quotes and sources.