Extinction Rebellion has gained attention around the world for its protests, which have included blocking roads, disrupting transport, spraying paint and vandalism.

The group aims to force governments to transform the current economic model so that radical action can be taken against climate breakdown, biodiversity loss and the risk of social and ecological collapse.

In a post to Facebook, Extinction Rebellion showed the group holding a large banner while member Doug Doig poured the organic molasses.

"It's time for us Boomers to start getting vocal about what dirty oil is doing to this country," he said in the post.

"This is a climate and ecological emergency - we need people like National Party leader Simon Bridges to tell the truth about the state of things. We need to move out of fossil fuels and into a new, justice-based vision of Aotearoa."