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Now people want to turn back the clock. Yet the plan sounds impossible. How do you kill millions of vermin across a country that’s the size of the United Kingdom? How do you ensure a few furtive rats won’t undo all the hard work by surviving and breeding?

Scientists are talking about the mission in military terms: choking off pests on peninsulas and then advancing the front lines from there; developing new traps and genetic weapons; winning the hearts and minds of children and farmers alike.

Momentum began growing five years ago when the nation’s leading scientist, Sir Paul Callaghan, delivered an impassioned speech. When it comes to heritage, he said, England has its Stonehenge, China its Great Wall, France its Lascaux cave paintings. What makes New Zealand unique, he asked? Its birds.

Callaghan was suffering from advanced cancer and could barely stand. But for over an hour he outlined his predator-free vision, saying how growing up he was inspired by efforts to reach the moon and how saving the birds could become New Zealand’s own Apollo program. He died a month later, but the vision grew.

Nine months ago, it became official government policy. Then-Prime Minister John Key announced a goal to wipe out the nuisance animals by 2050, calling it the “most ambitious conservation project attempted anywhere in the world.”

The goal has been embraced by many, although even its strongest supporters say it will require scientific breakthroughs. Some critics argue the plan should also have targeted feral cats or worry mice numbers might explode if rats disappear. Others say the effort is underfunded and overly ambitious.