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The relative price of cleaner options like natural gas influence choices made by industries ( Box 3 ) . Subsidizing the price of diesel fuel relative to gasoline stimulates the use of more diesel vehicles , resulting in a rise in particulate levels . In 1844 , the brothers Attilio and Emilio Bandiera and a group of companions landed on the Sicilian coast in an attempt to trigger a spontaneous uprising within the kingdom of Naples ( also known as the kingdom of the Two Sicilies ) . Songs and dances , essays and plays , illustrating the theme and accompanied by colourful banners , produced by the refugees , were showcased at selected venues . It is possible to burn biomass ( wood and agricultural residues ) quite cleanly , producing mostly carbon dioxide and water , but such conditions are difficult to achieve with small-scale inexpensive stoves . When war broke out with Austria in 1866 , the Italian government was able to use Garibaldi openly in the hostilities . Devaluation increased the price of imported inputs , agro-chemicals and machinery .