The second issue of Food Security is now published, and is free online. It documents some of the multiple causes of food insecurity.
Helium can be found in underground deposits in the earth. Helium can also be found in stars and other planets. The helium underground - and extracted from natural-gas - is a by-product of the natural radioactive decay of uranium, though is far too stable to be radioactive itself. It also occurs in very small amounts in the atmosphere.
Once released from the ground, it escapes rather quickly to space. Despite overall rarity on Earth, helium is concentrated in large quantities under the American Great Plains, available for extraction as a byproduct of natural gas. Do you know what the chemical symbol for Helium is?