Just over one in three of the world’s tree species are now at risk of extinction, according to the latest update of IUCN’s Red List of Threatened Species. For the first time, a majority of the world’s trees have been added to the list revealing that at least 16,425 of the 47,282 species assessed by the IUCN are at risk of extinction. This means that trees now make up over a quarter of the species on the IUCN Red List. The number of threatened trees is more than double the number of all threatened birds, mammals, reptiles and amphibians combined and tree species are at risk of extinction in 192…