accidental release of organisms Genetically engineered organisms that are released in the environment by mistake; once released they may exhibit some previously unknown pathogenicity, might take over from some naturally occurring bacteria (possibly having other positive functions which thus are lost) or pass on some unwanted trait to such indigenous bacteria. There is also concern that an uncontrolled genetic mutation could produce a form with hazardous consequences for the environment
transportation by pipeline Transportation of gases, liquids or slurries by a system of tubes, of steel or plastics. Petroleum, natural gas and products derived from them are the main substances transported by pipelines
