More than 1,000 scientists took part in the assessment of the conservation status of trees, compiled by the plant conservation charity, Botanic Gardens Conservation International (BGCI) and the International Union for Conservation of Nature (IUCN).
For the first time, the majority of the world’s trees have been listed on the IUCN Red List, revealing that at least 16,425 of the 47,282 species assessed are at risk of extinction. Trees now account for over one quarter of species on the IUCN Red List, and the number of threatened trees is more than double the number of all threatened birds, mammals, reptiles and amphibians combined. Tree species are at risk of extinction in 192 countries around the world.
“Today, we are releasing the global assessment of the world’s trees on the IUCN Red List, which shows that more than one in three tree species are threatened with extinction. Trees are essential to support life on Earth through their vital role in ecosystems, and millions of people depend upon them for their lives and livelihoods. As the IUCN Red List celebrates 60 years of impact, this assessment highlights its importance as a barometer of life, but also, crucially, as a unique tool guiding action to reverse the decline of nature,” said
Dr Grethel Aguilar, IUCN Director General.
In South America – home to the greatest diversity of trees in the world – 3,356 out of 13,668 assessed species are at risk of extinction. Innovative approaches are needed to protect the high number of tree species in the region, where forest clearance for crop farming and livestock ranching are the largest threats.
Perhaps the highest proportion of threatened trees is found on islands. Island trees are at particularly high risk due to deforestation for urban development and agriculture at all scales, as well as invasive species, pests and diseases. Climate change is increasingly threatening trees, especially in the tropics, through sea-level rise and stronger, more frequent storms.
IUCN
Forestry Journal
Scientific America