Get some dandelions growing in pots, then put them adjacent to your neighbors' lawns with fans blowing behind them
IIRC it's habitat destruction, so lawns, but probably mostly farms and livestock. There's a lot of overlap between climate change and the mass extinction event but they're independent crises and solving climate change won't necessarily stop everything from dying. However, if people would eat less meat, especially less beef, more land could be rewilded and greenhouse gas production would also slow. So they have overlapping causes and solutions but they're separate expressions of man obliterating the planetary boundaries.
I remember driving through this beautiful field of flowers and felt so bad if a bug hit the windshield. I realized recently how rare it is to hit a bug while driving now.
The unrecorded number of insect deaths from cars has to be huge. I hate cars so much.
https://www.wired.com/story/a-car-splatometer-study-finds-huge-insect-die-off/
i remember being stunned when i realized they sold giant bags of granular insecticide for pouring on your entire lawn to eliminate ALL bugs. basically just turning it into a lifeless living carpet.
Just let lawns have clover, it looks nicer anyway and it's soft to walk on.