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.
Helium is found in the sun or stars. It is also found in the  Earth's atmosphere.  +++  And underground: a stable product of the natural radioactive  decay of uranium, and â¦ extracted commercially from natural-gas. That  in the atmosphere may well have been released by volcanoes.