How do I add energy to my climate change and energy conference?

I am organising a short conference on climate change and energy at work. How best do I ignite people’s interest? Can you think of any interactive elements that I can use? Any ideas (however wild) are welcome.

I also want to minimise the carbon footprint of the event. Can you recommend any caterers that offset their energy expenditure?
Reply to D S – Yes I am a cult leader, but only in my spare time. This conference is being organised in my other capacity as a bureaucrat.

Ideas required – 10 points guaranteed