BP has forecast lower oil prices for decades to come as governments speed up plans to cut carbon emissions in the wake of the coronavirus pandemic.
It has cut price forecasts by about 30%, and expects Brent crude to average $55 a barrel from now until 2050.
As a result, the oil giant says it will revise down the value of its assets by between $13bn and $17.5bn (£13.8bn).
BP said it would have to become a "leaner, faster-moving and lower cost organisation".
Last week, the firm announced plans to cut 10,000 jobs following a global slump in demand for oil.
Countries across the globe have ordered people to stay indoors and not travel as a result of the coronavirus pandemic, which has caused a slump in demand for oil.
As a result, the cost of oil fell to less than $20 a barrel at the peak of the crisis, less than a third of the $66 it cost at the start of the year.
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