The ABC has a fantastic documentary on the topic of
oil
Crude - the incredible journey
You can see the doco at the website:
Crude - the incredible journey of oil - Broadband edition - ABC Science
This is very interesting doco and is quite matter of fact (rather than hysterical/judgemental) about what carbon is and how it became
oil and etc -
Make the point that we're all 100% recycled (even
oil is)
I hope you can find the time to look at it.
LoBelly