Tritium is produced by fission reactors, tritium decays into an isotope of helium.
So i think this is different from oil where oil can't really be produced.
I'm not saying we should crap all of our helium away, but I'm having a hard time being concerned about something that we can at least hypothetically produce.
Who says oil can't be produced? I mean, it doesn't make sense to use it as a fuel source since you'd have to put in at least as much energy as you'd be getting back out, but you can still produce it.
So i think this is different from oil where oil can't really be produced.
I'm not saying we should crap all of our helium away, but I'm having a hard time being concerned about something that we can at least hypothetically produce.
Also, more on deep earth nuclear reactors: http://www.pnas.org/content/98/20/11085.full