Their decline has been so sad. I moved somewhere with fireflies in 2007. The first year they were everywhere. The second year less so and they were completely gone by 2010. I always tried to leave longer grassy areas for them but they were just... gone. It was so so so sad. I didn't grow up with them and that first summer was enchanted and magical.
I have great memories of walking down the road on a hot night with thousands of slowly blinking balls of light. The person who lives in that place now probably doesn't even know that fireflies are supposed to be in the area.