Many of the world's most climate-vulnerable countries, the majority of which are African or small island states, produce a very small quantity of emissions.

But that does not rule out the possibility that a small quantity of the gas, calculated to fall within that error margin, was diverted to test some hidden centrifuges.

The end result is a small quantity of green-brown tinted liquid containing amino acids, peptides, sugars and salts and soft, porous white bone remains which are easily crushed.