A global agreement in the 1980s to cut CFCs and save the ozone layer has had an unexpected spinoff benefit.
Officials called the find a "stunning, fascinating, briefly alarming and shameful" discovery.
However it has recommended some changes for future drops.
"They need practical information about what steps to take."
The sounds could be heard by animals or insects coming within five metres of the plants.
Our action has been ranked as "insufficient".
"It is real. We need to take it really seriously today, because it is happening."
Fans unearthed a hypocritical photo of the Aquaman star.
Condemning agriculture does nothing to further environmentalists' cause, writes Adam Currie.
Commercial bioplastics facility plans to turn forestry waste into renewable food items.
"These farms have had significant and avoidable unlawful discharges."
Is chopping down a tree a year better - or worse - than its plastic counterpart?
The World Wildlife Fund has denied receiving a donation from DiCaprio
The removal of the trees has been described as "ethnic cleansing" by Mt Albert locals.
The new facility hopes to look after 150 eggs per year.
The 200kg stag was near a protected national park.
The Auckland Mayor is rubbishing suggestions an increase in the landfill levy will hit them in the pocket.
It's designed to tackle "New Zealand's mounting waste challenges".
"We want to be part of the drive to get rid of plastic."
Efforts to slow down or reduce emissions are failing miserably, new data shows.