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The Al-Omar oil field in Rmeilan, in northeast Syria, was captured from ISIS control by the Kurdish-led Syrian Democratic Forces on October 22, 2017. Photo: Hussein Malla / AP

Oil has been a key revenue source for ISIS, yet new data shows that production has steadily declined in areas under the group's control.

Historically, it has been difficult to get an accurate measure of ISIS's oil production. Past estimates extrapolated from chance observations at a small number of production sites — typically wherever journalists have had a source or intelligence documents have been seized. But that is like counting employees at a few McDonalds locations to draw conclusions about the number of workers across the fast food industry.

To arrive at a more precise figure, my colleagues and I developed a tool, as reported in a recent paper, that uses satellite imagery to evaluate in real time all 42 of the oil production sites once controlled by ISIS. The results show that production levels were approximately 56,000 barrels per day from July to December 2014. Production dropped to an average of 35,000 barrels per day throughout 2015, before declining further to approximately 16,000 barrels per day in 2016.

Why it matters: Our study shows that ISIS has been highly ineffective in managing its oil fields, limiting its revenue from these valuable assets and forcing it to fall back on taxation and extortion for funding. This data can also help to shape plans for rebuilding areas liberated from ISIS control by setting priorities for needed repairs and providing revenue projections for local economies.

Go deeper

Afghanistan's president coming to Washington on Friday

Ashraf Ghani, left, president of Afghanistan, and Abdullah Abdullah, chairman of the High Council for National Reconciliation. Photo: Sean Gallup/Getty Images

As the U.S. troop withdrawal accelerates, President Biden will welcome Afghan President Ashraf Ghani and Abdullah Abdullah, chairman of Afghanistan’s High Council for National Reconciliation, at the White House on Friday.

Our thought bubble: Axios politics editor Glen Johnson, who traveled to Afghanistan while working for Secretary of State John Kerry, said inviting both Ghani and Abdullah to Washington shows the administration’s respect for the delicate balance of power in the country.

Educators face fines, harassment over critical race theory

People talk before the start of a rally against critical race theory being taught in schools at the Loudoun County Government center in Leesburg, Va. Photo: Andrew Caballero-Reynolds/AFP via Getty Images

Elementary school teachers, administrators and college professors are facing fines, physical threats, and fear of firing because of an organized push from the right to remove classroom discussions of systemic racism.

Why it matters: Moves to ban critical race theory are raising free speech concerns amid an absence of consistent parameters about what teachings are in or out of bounds.

Updated 9 hours ago - Politics & Policy

1 dead after pickup truck hits Pride spectators in Florida

Police investigate the scene where a pickup truck drove into a crowd of people at a Pride parade in Wilton Manors, Florida, on Saturday. Photo: Jason Koerner/Getty Images

A driver in a pickup truck hit spectators at a Pride festival in Wilton Manors, Florida, killing a man and leaving another person hospitalized Saturday, authorities said.

Details: Fort Lauderdale Mayor Dean Trantalis told reporters police had "apprehended the driver" and that the vehicle missed a parade car carrying Rep. Debbie Wasserman Schultz (D-Fla.) "by inches."