Deforestation projections imply range-wide population decline for critically endangered Bornean orangutan

•We projected future deforestation in Borneo and quantified the impact on orangutans.•The habitat of 26,200 Bornean orangutans could be lost by 2030s.•Worst orangutan losses in forests in industrial plantations and unprotected forests.•Orangutans in protected areas and logging concessions are less threatened.•Land-use planning for biodiversity and development should consider future dynamics.