まずこの記事を見てください。 More than 75 percent decrease in total flying insect biomass over 27 yearsThe total flying insect biomass decreased by more than 75 percent over 27 years in protected areas, according to a study published October 18, 2017 in the open-access journal PLOS …phys.org 日本語訳すると 過去27年間で 羽を持つ全…