Does anything in the environment cause strong feelings in you? For example, how do you feel about people littering? Air pollution? Global warming? If you feel strongly about an issue, you are likely to give a good speech. Be sure you have some facts to back up what you say, not just your emotions.
Here is a website about giving an impromptu speech. Although you have time to prepare, this might be useful in some way.
The car, boon or bane?
You could talk about the advantages and disadvantages of the automobile stressing the environmental aspects - much more than just pollution and green house gases.
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