Methane is a greenhouse gas this is true.
However, to understand how infinitesimally little there is in the atmosphere we need to give some examples of what portion of the atmosphere is made up of cow farts. And then New Zealand’s share of this (non)problem.
There are 1.8 parts per million of methane gas in the atmosphere. Of the anthropogenic caused methane, New Zealand is responsible for 0.3% of this gas.
So to put this in prospective, if you were to walk from Manukau to Orewa and the portion of methane in the atmosphere was represented by the distance of your journey. The first 15 cm would be how far you would need to travel to represent the total content of methane. In terms of New Zealand’s contribution to this, would be half of a millimetre of this journey.
But we need to stop eating meat.
Check out a scientific view of this nonsense.