- "Our models indicate that between 1999 and 2015, half of the orangutan population (~100,000) was affected by logging, deforestation, or industrialized plantations. Although land clearance caused the most dramatic rates of decline, it accounted for only a small proportion of the total loss." http://www.cell.com/current-biology/fulltext/s0960-9822(18)30086-1 7 comments science