Grist: When BP`s Deepwater Horizon oil rig exploded in 2010, it hemorrhaged roughly 210 million gallons of crude into the Gulf of Mexico. We know now, thanks to recent court hearings and settlements, that all this happened because oil company managers were cutting corners on safety, and the federal governments monitoring system for offshore drilling was broken.
We also know that it wasn`t the first time oil companies had spilled in the Gulf. What we dont know - and probably never will - is how much...