No fireflies where I grew up (western Canada). But I have been suspecting the same thing for many years, due to the fact that grasshoppers are now rare where I grew up in summer, and after a drive across Alberta to the west coast of BC (over 12 hours of highway), I can look at the front of my vehicle and see barely any dead bugs. When I was a kid a car would be absolutely plastered with bugs on any trip of such a length. There are just many, many fewer insects these days. And when insects diminish, the food chain all the way up must be suffering.

'Sup?

In such cases, I recommend watching the film "Blade Runner 2049", it accurately shows what we will come to.

Huh where I live in Ohio, I saw the most I’ve seen in the last few years

My cousin came to visit me (Northern California) from Southern California and asked how I keep my car so clean and free of smashed bugs. I’d forgotten about how car bugs were a thing.. I literally can’t remember the last time I had to clean a bug off my car.

I live in an agricultural area so I’m guessing it’s pesticides.

I guess SoCal still has bugs though. And boy do I ever have leaf eating beetles in my garden.