Within the last two centuries of industrial production, the mining industry and different urban activities caused environmental contamination on a large scale. Agricultural practices, especially those of the twentieth century, are also responsible for the widespread contamination of soil, sediments and water, not to mention wars and different conflicts responsible for production, use and storage of explosives and chemical warfare agents (Macek et al. 1998; French et al. 1999). Considering the rapidly growing world population and the detrimental impact of agricultural systems on the environment (Zechendorf 1999), the cleaning of large contaminated sites is important for ensuring sustainable development, because it might reduce pressure to expand into the wilderness, rainforests and marginal lands, thus supporting biodiversity and preservation of vital ecosystems. Air contamination by volatile toxic compounds is also an important problem.