To ban sky lanterns as they are dangerous to wild life and course fires which all so harms the environment and also they are litter 

when animals eat them it punchers there stomach and kills them

birds get trapped in them

they set fire to fields and moorland causing untold damage

they set fire to buildings hay stacks crops thatched houses

they are incendiary devices invented by Chinise army to burn crops of other country’s in war time

also they are blatant littering of the countryside what goes up must come down

they even cause harm to sea creatures