The recent deaths of eight people in two New Zealand landslides has left the public searching for answers. Some questions will be technical, about what failed and why.

But one should surely sit above the rest: why do we keep accepting the human and financial cost of this risk?

While it might be assumed that earthquakes or volcanic eruptions are Aotearoa’s deadliest natural hazards, landslides have claimed more than twice as many lives – approximately 1,800 – as both combined over the past 200 years.

They remain such an insidious and under-appreciated hazard because they cause deaths relatively frequently, but typically only in small numbers. Being one of the most fatal New Zealand landslides since 1846, last month’s tragedy at Mount Maunganui was a stark exception.

A useful analogy is our tolerance for car crashes versus aeroplane crashes. Road deaths in New Zealand kill hundreds of people each year, one by one, with little national reckoning. The 1979 Mount Erebus air disaster, in which 257 people were killed in one afternoon, forever changed aviation policy and remains part of the country’s collective memory.

In natural hazard terms, landslides are car crashes; earthquakes and volcanic eruptions are aeroplane crashes. Yet, with climate change driving heavier rainfall, it’s worth asking whether this is a danger we should be comfortable to continue living with – and paying for.

Since........

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