Dairy farmers could increase their profits and reduce their methane emissions by 20 per cent at the same time, right now, according to Green Party activist and former leader Jeanette Fitzsimons.

All it would take, she told the parliamentary select committee hearing submissions in Auckland on the Zero Carbon Bill, is to reduce the dairy herd and improve existing feed practices.

In a hard-hitting submission, Fitzsimons also warned that urgent reductions in greenhouse gas emissions are "much more important" than setting long-term targets.

Significant progress is possible right now, she said. And recent research has suggested two types of emissions

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