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Researchers say that they have pinpointed the major sources of a mysterious recent rise in a dangerous, ozone-destroying chemical.
The nation's nurses are warning a failure to combat climate change may enable new diseases to spread.
The government has proposed further changes to the emissions trading scheme, including tougher penalties and higher costs for emitting greenhouse gases into the atmosphere.
Drones will be buzzing around some of Auckland's beaches next summer, as the council ramps up its water quality testing.
Groundwater scientists are using John Saywell's Canterbury farm to measure how well buried trenches filled with woodchips and bacteria break down nitrates in drainage water. Audio, Gallery