Some of the world's strangest species could vanish before\ud they're discovered

Scientists have described around 1.5 million species on Earth - but how many are still out there to be discovered? This is one of the most heated debates in biology.\ud Discounting microbes, plausible estimates range from about half a million to more than 50 million species of unknown animals, plants and fungi.\ud \ud This biodiversity matters because it could be used to fight human diseases, produce new crops, and offer innovations to help solve the world's problems.\ud \ud Why is there so much uncertainty in the numbers? The biggest reason, I argue, is that a lot of biodiversity is surprisingly hard to find or identify. This has profound implications for nature conservation and for our understanding of life on Earth