Testing any of these claims or counter-claims is difficult.

ECONOMIST: POLITICS BRIEF: The people’s voice | The

The Sunshine to Petrol project is testing a prototype device called the Counter Rotating Ring Receiver Reactor Recuperator (called CR5 for short) which turns CO2 into carbon monoxide which could then form part of a liquid fuel.

CNN: Turning carbon dioxide into fuel

While pharmaceutical firms need to prove their drugs are safe with years of testing, dietary supplement makers can sell pills over the counter unless the government can prove their products are unsafe.

FORBES: The Ephedra Battle Moves To The Courts