A protest to stop Fonterra from burning coal in its factories is underway in South Canterbury.
Five people, including former Green Party leader Jeanette Fitzsimons, have chained themselves to the gate of the Clandeboye Dairy Factory.
She said Fonterra is the second biggest user of coal in the country, and they have been trying for some time to get the company to switch to wood chips.
Ms Fitzsimons said they have no other option to get their point across, as Fonterra simply haven't listened to other attempts to stop the use of coal.
"We are blocking the gate that the coal trucks come through to supply the Clandeboye Dairy plant, and forcing them to go around the long way."