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RE: Endangered elements: Let's save helium.
Yes, in fact, one of the main storage methods is to combine it in tanks with 20% oxygen. But it has great limitations.
You can check this article.
http://assisted-dying.org/blog/2015/04/24/australian-warning-on-diluted-helium-tanks/
As I understand the quoted article, they've started selling party balloon helium in the Australia with 20% added oxygen in order to prevent deaths from people inhaling the helium (either as a party trick getting squeeky voices, or as a means of suicide). The article recommends anyone planning to suicide by helium inhalation to check that their helium doesn't contain significant amounts of oxygen.