I have a standard, 2 compartment, wooden compost bin which I cover with a sheet of plastic. I mix and move my compost about every 2 weeks but as I've been using a lot as a mulch lately, I've been doing it more often. I was moving some today, from one side to the other and the centre of the heap was actually burning. The compost was almost black and it was smouldering. Is it in danger of actually catching fire ? I am planning on watering it every day to keep it cool until I have figured out what I should be doing. Any advice will be appreciated.