nature polution sky smog sun sunrise sunset burn chimney fire industrial smoke spring clouds chemical energy oil petro refinery city factory houses industry population town urban action animal anti-ecology clean conciousness dirty earth ecology garbage neighborhood nocive pollution responsability separation trash abyss acid acidic Campi Flegrei chemistry condensation crater crest crevice cristals damp dangerous devil flowers fracture fumarole fumes geologic geology heat hell hot hydrogen landscape Mineral minerals Pozzuoli rock smell smelly solfatara steam sulfur sulfuric sulphur sulphuric unpleasant vent volcanic volcano vulcano yellow air breathe climate cloud dioxide ecological ecologically emissions exhaust fuel gas global harmful health intoxication noxious ozone pipe poison poisoning power precipitation snow substance toxic trees warming white winter