One in three tree species at risk of extinction: report

CALI, Colombia: More than one in three species of trees are at risk of extinction worldwide, threatening life as we know it on Earth, according to a report published Monday. The warning came in the Global Tree Assessment, contained in an update of the International Union for Conservation of Nature (IUCN) Red List of Threatened Species.

Issued to coincide with the UN´s COP16 summit on biodiversity, held in the Colombian city of Cali, the report said over 16,000 tree species are at risk of extinction. More than 47,000 species were assessed for the study, out of an estimated 58,000 species thought to exist in the world.

Trees are felled for logging and to clear land for farming and human expansion. Climate change poses an additional threat through worsening drought and wildfires.

The numbers are not merely symbolic. People “rely on tree species for food, timber, fuels (and) medicines,” expert Emily Beech told AFP. They also make the oxygen we breathe, and absorb heat-trapping carbon dioxide emissions from the atmosphere.

“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,” said IUCN director general Grethel Aguilar. A 2015 study estimated there are about three trillion individual trees in the world.

The study, published in the science journal Nature, estimated that over 15 billion trees are cut down each year, and the global number of trees has fallen by nearly half since the start of human civilization.