Pretty breathless.
From Wikipedia—
Estimates of the total number of insect species or those within specific orders are often highly variable. Globally, averages of these predictions estimate there are around 1.5 million beetle species and 5.5 million insect species with around 1 million insect species currently found and described.[42]
A pie chart of described eukaryote species, showing just over half of these to be insects
Between 950,000–1,000,000 of all described species are insects, so over 50% of all described eukaryotes (1.8 million) are insects (see illustration). With only 950,000 known non-insects, if the actual number of insects is 5.5 million, they may represent over 80% of the total, and with only about 20,000 new species of all organisms being described each year, most insect species likely will remain undescribed, unless species descriptions greatly increase in rate. Of the 24 orders of insects, four dominate in terms of numbers of described species, with at least 670,000 species included in Coleoptera, Diptera, Hymenoptera and Lepidoptera.
As of 2017, at least 66 insect species extinctions had been recorded in the previous 500 years, which generally occurred on oceanic islands.
So there have been 66 species gone extinct in 500 years. Now we are to believe there are at least 1,000,000 and maybe 5,000,000 species and 40% (400,000-2,000,000) that are threatened in the next 80 years. What nonsense.