VIENNA (AP) — OPEC says growth in global oil demand will steadily lessen from an annual average of 1.3 million barrels a day between 2016 and 2020, to 300,000 barrels a day by 2035-2040. But it says fossil fuels will remain the main energy source decades from now.

The organization's annual World Oil Outlook published Tuesday says renewables are projected to record the fastest growth but their share of total energy supply is still anticipated to remain below 5.5 percent by 2040.

The report by the 14-nation Organization of the Petroleum Exporting Countries says that the use of fossil fuels — 81 percent of the global energy mix in 2015 — will decline by 2040. But the cartel says they will still account then for 74 percent of all energy used.