burnt

A smoke point is the point at which the fats in the oil start to break down and nasty compounds are released which can make the oil taste bitter, burnt or unpleasant.

By four minutes, the foul stench was gone, replaced by an "average burnt rubber" scent.

A couple were left badly burnt after fleeing for their lives when their fireplace exploded, engulfing their home in an "orange fireball".

Buildings have burnt down, homes have been looted and ransacked, and politicians have been dragged from their houses and beaten.

Such fuels can result in much lower emissions than fossil fuels when burnt, because they do not release long-stored CO2 into the atmosphere.