Guardian: <figure> <figcaption>Sanderlings feed as workers search the beach for oil debris in Grand Isle, Louisiana. Photograph: Lee Celano/Reuters</figcaption> </figure> Juan Antonio Dzul was a teenager when the Ixtoc 1 oil rig collapsed in June 1979 in the Gulf of Mexico, 70 miles from the fishing town of Champotón where he grew up and still lives. The memory of the huge spill that followed is etched on his mind. "The oil covered the reefs and washed up on the shore. Fish died and the …