Paris (AFP) – Half of the one million animal and plant species on Earth facing extinction are insects, and their disappearance could be catastrophic for humankind, scientists have said in a “warning to humanity”.”The current insect extinction crisis is deeply worrying,” said Pedro Cardoso, a biologist at the Finnish Museum of Natural History and lead author of a review study published Monday. “Yet, what we know is only the tip of the iceberg,” he told AFP.The disappearance of bugs that fly, crawl, burrow, jump and walk on water is part of a gathering mass extinction event, only the sixth in th…