This could also be filed under problem solving: how do you measure the decline of a population? What’s your baseline? How do you account for potential outliers? How do you use a single data collector to determine the impact on an entire region.
The extract below makes for fascinating yet chilling reading.
Danish zoologist Anders Pape Møller counted the number of insects killed on the windscreen of a single car after each of 1,375 journeys along the same stretch of road between 1997 and 2017. After accounting for time of day, weather, and other factors, Møller says his data suggests an 80% decline in flying insects during that time.