Along the banks of a nine-kilometer stretch of the Rio Doce in Brazil are bright orange barriers similar to ones deployed at sea to help contain oil spills. The barriers were erected to protect plants and animals along the banks from toxic mud that has traveled more than 500 km from a collapsed dam that was holding wastewater produced by mining activities. The 2.2 billion cubic feet of toxic mud has now reached the Atlantic Ocean. On its way to the Ocean, the mud destroyed villages close to the dam and leveled approximately nine square kilometers of vegetation.