Two in five of the world’s plant species are at risk of extinction as a result of the destruction of the natural world, according to an international report. The Guardian reports that plants and fungi underpin life on Earth, but the scientists said they were now in a race against time to find and identify species before they were lost. These unknown species, and many already recorded, were an untapped “treasure chest” of food, medicines and biofuels that could tackle many of humanity’s greatest challenges, they said, potentially including treatments for coronavirus and other pandemic microbes. The finding makes supplies vulnerable to changes in climate and new diseases, especially with the world’s population expected to rise to 10 billion by 2050.