Here in the ultra-dense Netherlands, threats to insects are magnified. As such, it's easier to point to specific causes. Butterflies: 50% reduction in 50 years. Beetles: 75% decline since 1985. Ladybugs: 50% reduction in 20 years. Across the border in Germany: a 75% decline in flying insects since 1989. It doesn't take much of a scientist to see the trend. I've been hiking the forests here multiple times per week for…
It’s also sad to see what people are doing to their gardens over here. Fake grass, no plants/just bricks. Not to mention the municipalities mowing nice patches of grass/plants/flowers where insects thrive.
Fortunately, on the other side ... I have the head of the groene commissie (neighbourhood gardening enthusiastc) and a beautiful tended garden. Mine is the most natural: a barely-tended jungle which gets trimmed and brushed once a year. We have hedgehogs!
We installed ~200m^2 of green roofs in the neighbourhood and there are bug hotels all over the place so we are doing relatively well. Quite a few different varieties of bees.
All this green absorbs a lot of heat, and manages rainwater which is important at 0 above sea level and 2m below the nearby canal.