Researchers have become increasingly concerned about dramatic drops in populations of insects, which underpin much of nature. Some warned in February that these falls threaten a “catastrophic collapse of nature’s ecosystems”, while studies from Germany and Puerto Rico have shown plunging numbers in the last 25 to 35 years.

https://www.theguardian.com/environment/2019/mar/28/insect-decline-will-cause-serious-ecological-harm