Every time one of George Moss's cows belches, it adds to New Zealand's biggest climate change headache.

It's not the Tokoroa dairy farmer's fault that these, and any other of the millions of ruminant livestock that graze our pastures, are methane-making machines.

It starts when they munch on carbon-carrying grass. As this gets digested by microbes in their stomach, some of the carbon is converted to methane.

When it's belched, it rises into the atmosphere where it helps to trap heat, before finally breaking down into carbon dioxide.


Moss and wife Sharon, like many farmers, have tried to minimise their