In 2019, oil was found seeping from a California railyard into the Sacramento River; six years later, cleanup had removed 75,000 gallons of oil and 100,000 tons of contaminated soil.

In Dunsmuir, California, some folks found an old train fueling station that had been leaking oil, and it caused a big mess for the environment.

They started looking into it back in 2019, and it turned out that this pollution problem had actually been going on since way back in the 1900s.

That's a long time!