From: https://www.nature.com/articles/d41586-019-03241-9

Insects have pivotal roles in terrestrial ecosystems. These organisms dominate global animal biodiversity in terms of their biomass, species numbers and total population numbers, and they perform important ecosystem functions and services such as pollinating flowers, disposing of dead organisms and waste, and forming crucial links in food webs.

The results (as reported here) suggest that major drivers of arthropod decline act at larger spatial scales, and are (at least for grasslands) associated with agriculture at the landscape level. This implies that policies need to address the landscape scale to mitigate the negative effects of land-use practices.