What is the main threat against Glow worms and why is it happening e.g natural threat or man made threats.

Question: What is the main threat against Glow worms and why is it happening e.g natural threat or man made threats.
- Keywords:
  glow worm,
  man made,
  natural,
  threat
Asked by 2plus2is4 to Glow Worm on 21 Nov 2017.
- Glow Worm answered on 21 Nov 2017:
  
  We don’t really know why glow-worms are disappearing but we think there are probably several reasons, all of them man-made, including their habitat being destroyed, chemical pollution (from cars, factories, farmers spraying fields etc) and light pollution from streetlights.

Question: What is the main threat against Glow worms and why is it happening e.g natural threat or man made threats.