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 deposits in the earth's crust are thought to have been created by radioctive decay of elements like uranium and thorium. But the largest naturally occuring source of helium is found in natural gas.elium (and the other noble gases that are normally chemically unreactive) are found in volcanic gas emissions. But unless it is really, really large you're not going to be mining it for helium; there just wouldn't be enough to collect there to make it worthwhile.