John,
You'll then be aware of the research that has shown that a small amount of a specific seaweed fed to ruminants cuts the methane emissions by up to 98% -- not "snake oil" but solid scientific research backed up by animal trials in australia and america and research in Ireland (Bantry Marine Institute) shows that seawater in Ireland does and can increase the growth of this weed. The real thing now is to optimise the means of adding this to the diet of animals that don't always have a diet including added feed which can contain the seaweed. The outcome of cracking this could be really huge in countries like India with many thousands of times the number of ruminant animals that Ireland has!!!
