Spontaneous combustion

During the week our mate Geoff sent me a message asking if I knew why our grey plastic compost bin was melted and smouldering. He was in Culebrón and we were in Cartagena. I didn't.

All I could presume was that the rotting vegetable matter had heated up inside the composter and produced some flamable gas. Hey bingo!, spontaneous combustion.

There wasn't much left to look at when we got back. It must have produced a good deal of heat though as there is damage to the nearby fig, apple and plum trees.