Where have insects gone ?

https://www.nationalgeographic.com/magazine/2020/05/where-have-all-the-insects-gone-feature/

https://natgeo.nikkeibp.co.jp/atcl/news/20/041700245/

昆虫たちはどこに消えた?

This is an important issue in the world.

https://phys.org/news/2020-02-half-a-million-insect-species-extinction-scientists.html
https://www.nature.com/articles/d41586-019-03241-9