What are some speech topics?

A good speech should make a point, be it in politics or global warming etc. Here a few good ones ive made or heard -

- Plastic Surgery, and why noone wants to 'grow old gracefully'

- Playing God - New sciences to clone people, choose the sex of your baby

- Racism

- How the media can influence people

- Who are the real superheros? ... Not superman / firefighters etc.

- How children can get 'addicted' to wanting movie merchandise,

eg. Hannah Montana doona covers , lunch boxes , tshirts. etc.