Security surveillance of employees

What should you do if some members of an audiences don’t know the meaning of a term you are using, but other members of the audience do?
Why is it important to relate a speech to the listeners’ self-interests?
How could each of the following topics be presented in a way that would satisfy a listeners’ attitude of “What’s in it for me?
Rain forest destruction
Security surveillance of employees
Solar energy
Homeless people

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