Shale oil is well-known to have significantly higher CO₂ costs than conventional crude. At least it's (generally) EROEI-positive, finally (though much of that

Shale oil is well-known to have significantly higher CO₂ costs than conventional crude. At least it's (generally) EROEI-positive, finally (though much of that is a result of burning the lower grade stuff to fractionally distill off the higher grades, which materially contributes to the CO₂ problem...).