World More than 40 percent of insect species declining, could have ‘catastrophic’ results, study says February 12, 2019February 12, 2019 Brett Molina, USA TODAY Comments Off on More than 40 percent of insect species declining, could have ‘catastrophic’ results, study says More of than 40 percent of insect species are declining, creating potentially 'catastrophic' consequences for the planet, says a study.