Planely Mad

The Japanese intend to chuck 100 paper planes into orbit. Constructed from silicon treated, heatproof paper and measuring around 20 cm in length, the places will depart from the International Space Station and head earthward. The planes will cover around 300 miles in their journey and most probably land in the sea. However, I’m midly concerned what might happen if they don’t! How much damage can a paper place cause if it has travelled down from orbit and covered about 300 miles to really top up base velocity? Can we expect people to suffer severe injuries from smouldering paper planes travelling at terminal velocity? What about birds? Or planes? Has someone actually taken a moment to really think this through?