Labour Party leader David Cunliffe says his party would bring agriculture into the Emissions Trading Scheme in a matter of years if elected to government.
Previous Labour policy has been to introduce agriculture to the scheme by 2013.
Mr Cunliffe told Radio New Zealand's Morning Report programme on Monday he would delay the introduction to give farmers time to adjust, but would not say exactly when the change would happen.
"I'm just going to have another look at that. My understanding is that they would move in on a timetable over a relatively small number of years."
Mr Cunliffe rejected Bill English's claim that Labour's climate policies would push power bills up by $500 a year on average.
The agricultural sector makes up more than half of New Zealand's carbon emissions.