Ardern said her coalition government, which includes the Green Party, was facing up to environmental challenges and "just like climate change, we're taking meaningful steps to reduce plastics pollution so we don't pass this problem to future generations."

Single-use plastic bags are among the most common items found in coastal litter in New Zealand and the environmental group Greenpeace welcomed the decision to outlaw them.

"This could be a major leap forward in turning the tide on ocean plastic pollution and an important first step in protecting marine life such as sea turtles and whales, from the growing plastic waste epidemic," Greenpeace Oceans Campaigner Emily Hunter said.

A United Nations report in June said up to five trillion grocery bags are used globally each year, which is nearly 10 million plastic bags per minute.

"If tied together, all these plastic bags could be wrapped around the world seven times every hour" and like most plastic garbage barely any is recycled, said Erik Solheim, head of UN Environment.

The UN said more than 60 countries had introduced bans and levies on single-use plastic items like bags.

But better waste management, financial incentives to change consumers'

buying habits and research into alternative materials were needed to make any real change, it added. (AFP)