Explosive remnants of war in the human environment

The numerous wars always in progress somewhere or other on Earth continue to rely for their deadly, destructive, and environmentally damaging effects on explosives, fire, and other conventional means. Such means of warfare can do terrible immediate and long-term damage to humans (both combatants and civilians), to their artefacts and livestock, and to nature. I single out here for exposition the use of land mines and other weapons with similar long-term effects; these are a gruesome and much used means of warfare that is often taken for granted, but for which at least a partial remedy is available.