why we are advised never to sleep in a room with burning or smouldering coal fire in it?

Why do you have to use paper or kerosene oil to start fire in wood or coal?

Debate the following issue in class. the estimated coal reserves are said to be enough to last us for another two hundred years. Do you think we need to worry about coal getting depleted in this case ? Why or why not ?

GIVE REASONS - WHY : Objects are not seen clearly when we enter from bright light to a room with dim light.