a biodiversity catastrophe
My first "serious outdoor project" was a butterfly collection in the late-1950s, age ~6.
My father made me a net and I ranged my allotted territory of approximately 2-3 blocks in each direction in our residential neighborhood. Within a couple of years I had a pretty nice collection of at least twenty good specimens of larger butterflies - including a few moths (I liked all of them but ignored anything smaller than about the size of a half dollar for the collection).
Fast-forward 60+ years and I seldom see any butterfly, and even then they are almost always small and only from a very limited spectrum of choices. Even when I hike semi-regularly in the Smoky Mountains I see precious few of them - even miles from "civilization" ....
I have established a patch of milkweed (roughly 10 feet in diameter) (which is hard to start but then becomes invasive) in hopes of attracting Monarchs. This is the 3rd year and I have yet to see one here.
Don't even get me started on trying to keep 2 beehives going!