BELEM, Brazil, Nov. 20 (UPI) -- According to research newly published in the journal Science Advances, half of all tree species in the rain forests of the Amazon are on the decline, threatened by deforestation.
It's one of the first studies to look at deforestation in the Amazon on a species-by-species basis. Scientists have been noting the precipitous decline of tree stocks since the 1950s, but most research efforts have focused on total volume.