‘Half the tree of life’: ecologists’ horror as nature reserves are emptied of insects

A new point in history has been reached, entomologists say, as climate-led species' collapse moves up the food chain even in supposedly protected regions free of pesticides

Daniel Janzen only began watching the insects - truly watching them - when his ribcage was shattered. Nearly half a century ago, the young ecologist had been out documenting fruit crops in a dense stretch of Costa Rican forest when he fell in a ravine, landing on his back. The long lens of his camera punched up through three ribs, snapping the bones into his thorax.

Slowly, he dragged himself out, crawling nearly two miles back to the research hut. There were no immediate neighbours, no good roads, no simple solutions for getting to a hospital.