There are two main incentives for this, the first being the geological feature that natural gas is in finite supply and world production of it is thought might peak within the next few decades, and secondly that burning fossil carbon contributes to the atmospheric concentration of CO2, which scientific consensus accords will cause global warming and climate change.

FORBES: U.K. Joins Europe On Biogas 'Waste Into Energy' Strategy

Yet executives played down the latest indications of a slowdown, saying Asia still offers growth potential that is among the most valuable of any global region, spurred by rising numbers of aspiring drinkers, as well as a high concentration of the super rich.

WSJ: Diageo, Remy Flag Asia Woes