https://www.theguardian.com/environment/2025/jun/03/climate-species-collapse-ecology-insects-nature-reserves-aoe
Heat-driven declines could have repercussions far beyond their immediate surroundings. In the past, even if pesticides wiped out insects over an agricultural region, as long as healthy populations remained elsewhere, species could return if the spraying stopped.
“Climate change is impacting all those different little spots at the same time. It doesn’t just affect one particular spot that gets a pesticide dose or gets a tree cut down,” Janzen says. “If the insect population collapses and it happens everywhere, you don’t have a residual population.”
Today, as well as being an ecologist Wagner feels he has taken on a second role – as an elegist for disappearing forms of life.
“I’m an optimist, in the sense that I think we will build a sustainable future,” Wagner says. “But it’s going to take 30 or 40 years, and by then, it’s going to be too late for a lot of the creatures that I love. I want to do what I can with my last decade to chronicle the last days for many of these creatures.”
Decades on from his months spent bound to the rocking chair, Janzen still watches. He records the yearly data, the shifts in dominant species. But today, there is so much less to see. Once, when he and Hallwachs would type up their notes in the night, they would pitch a tent in the living room to protect their computers from thousands of moths that flocked to the blue glow. Now, they work with the house open to the forest air. “I find myself saying, ‘Winnie! A moth has arrived at the light on my laptop,’” Janzen says. “One moth.”
Elsewhere in their profession, some scientists are starting to look away. “We know quite a number of entomologists who have experience dating back to the 70s, 80s or 90s,” Hallwachs says. “One of our very good friends – he now does not have the emotional courage to hang up a sheet to collect moths at night. It is too devastating to see how few there are.”