That's an interesting calculation you have there. We wouldn't want something bad to happen to it. My associates and I offer coverage against unanticipated rises

That's an interesting calculation you have there. We wouldn't want something bad to happen to it. My associates and I offer coverage against unanticipated rises in gas prices. We call this prote^h^h^h^h^h insurance. More seriously, I can see how this might make sense in the US, assuming that US domestic gas production and politicians can keep the fossil fuels flowing, but the calculations have much wider error bars where I live. For me, US$20k over 20 years is a lot of nights not tossing in my sleep while I dream uneasily of tomorrow's headlines.