Going off the deep end talking about post-peak worst case scenarios is likely to meet with a wall of denial. I think the key thing to communicate is initially just how complacent we've been over energy for so long, and how in the near future there's likely to be real economic pain, whether there's is a long term solution or not.
For most people energy is one of those issues which is just somebody else's problem. The world is full of such problems, and most people get pretty good at ignoring them and just getting on with their lives. You've got to communicate is that energy issues are soon going to be everybody's problem; impacting everything from the value of your pension and your house to holidays in the Caribbean.
A lot depends on just how much your audience respects your opinion. It's easy to sound hysterical about these issues, so it's usually best to deal with facts as far as possible, and try not to overdo the apocalyptic speculative visions that get your opinion filed under 'crank'.
I've engaged in a kind of mental war of attrition with my own father on this issue over the last year or so, which I can claim partial victory in, mostly thanks to the way events have largely backed up my views.
Of course since energy issues have crept on to the business pages of The Daily Telegraph and The Sunday Times I now have to occasionally pour scorn on the tripe contained therein. Unfortunately there's a limit to how much pessimism he can take. He refuses to sell the buy-to-let property that's nearly doubled in value in a couple of years, and doesn't accept the possibility of a house price crash in the near future as a consequence of 'peak panic'.
Once you get into the nitty gritty of consequences and actually taking action then it's a different ball game.
The trouble with peak oil is that the implications undermine a lot of core assumptions about life as we know it in the western world. Getting people to wake up and accept realities that run counter to these assumptions depends a lot upon how skeptical they are of these assumptions in the first place.
After getting my father to sit through The End of Suburbia he was a lot less dismissive than he had been, but it didn't take long for the denial to begin creepting back. C'est la vie. At least I tried
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