Brussels, 24/07/2007 (Agence Europe) - According to the latest EurObserv'ER barometer, biogas production in 2006 was up 13.6% compared to 2005 (i.e. 5 346.7 ktoe). This figure only includes production intended to be valorised and therefore does not include biogas burned off in flare stacks. Biogas is the gas produced when animal or plant organic matter ferments under unaerobic conditions. Such fermentation is also known as methanisation and naturally occurs in marshes for example, or...