Their low gas consumption compared to flame devices not only reduces the emission of CO2 and nitrous oxide, but also keeps the treatment costs well below that of all kinds of other methods of weeding. Because the infra red radiation penetrates only 1 to 2 mm into the soil, according to the publication "Abflammtechnik" (pyro-weeding technique) by Professor Hoffman of the Higher Institute of Weihenstephan-Triesdorf (Germany), they cause absolutely no damage to the micro organisms present in the soil, whereas the pathogenic agents and molds present on the surface are eliminated.