In the Northern Hemisphere, the Perseid meteor shower will hit its peak on Sunday and Monday. It’s caused by the Earth orbiting through the tail of a comet. The debris in the tail crashes through the Earth’s atmosphere and makes the meteors you see — if you can see them at all. Dark skies are getting harder to find. But some places are now trying to protect their dark nighttime skies. Bjarne Sørenson helped create a dark sky preserve in Denmark. He joins The World’s Host Carolyn Beeler for a conversation about light pollution, and growing efforts to fight it.