On human time scales, all the points in the other answer are valid and important. On geological time scales – or even shorter ones, like hundreds and thousands of years – soils, wetlands, everything recovers from issues like oil spills, volcanic eruptions, ice ages.
It especially depends on the size of the spill. If we’re talking a quarter-cup of oil dripped out because of a messy oil change, that will biodegrade within a few years. If we’re talking thousands upon thousands of gallons like from the Exxon-Valdez, then it will take many more years to recover.
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