The decline is really noticeable. (I live in Germany.) You can go bicycling in the countryside in summer and never get any insects in your mouth. You can drive your car and not wipe off your windshield.
If you look at the graph you can adda trend line for poor years and one for good. Both point steeply downwards, say -30%/decade. Extrapolate to human lifetimes, and you get a 96% drop in one human lifetime. Wow.
If you look at the graph you can adda trend line for poor years and one for good. Both point steeply downwards, say -30%/decade. Extrapolate to human lifetimes, and you get a 96% drop in one human lifetime. Wow.