"The Deepwater Horizon disaster will probably be remembered as the most severe environmental disaster of the early twenty-first centurya man-made disaster that would have been as easy to prevent as it is now difficult to clean up."That's the verdict of Tom Speight, an environmental scientist and hazardous materials manager, in a web-exclusive article for Commonweal. He explains how BP cut corners and why cleaning up the resulting mess is so complicated. Read his take: "Shoddy Work, Shabby Excuses."