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With much of the North Island's landscape destroyed, as well as homes and livelihoods, one of the big questions since Cyclone Gabrielle is just how so much forestry slash was allowed to sweep through the country - taking out bridges, and worsening the devastation.
Pressure is mounting on the government to fast-track an inquiry into slash - which is basically all the woody debris leftover after the clear-felling of forestry,
Scion principal scientist Dr Tim Payn spoke to Max Towle.