The Green Party are hypocrites given their MPs' spending on flights, Act leader David Seymour says.
However, the Greens have dismissed the criticism as a "boring gimmick", and say it is caucus policy to offset all air miles.
Mr Seymour said the latest release of expenses shows that in October, November and December the average Green MP spent $7992 on air travel -- the highest average amongst political parties.
"Green MPs' expenditure on air travel is extraordinary for several reasons," said Mr Seymour. "These are the MPs who regularly tell us that climate change is the crisis of our time and we must reduce our emissions."
Mr Seymour said the average Green spend of $7992 compared with an average spend by Labour MPs of $7790, $5493 by National MPs, and $5998 by NZ First MPs.