Authorities are investigating after an unidentified pink substance was discovered in the upper reaches of Whangamata Harbour.

Record high carbon emissions sounds an alarm about risks to nature from man-made global warming.

Last week, the image of a herd of cows in a pristine high country lake provoked widespread outrage, writes Dame Anne Salmond. The mood of the country has changed.

During cold winter days, Anumita Choudhury dare not leave her small second-floor apartment in New Delhi's northern suburbs.

OPINION: China's air pollution is a consequence of its efforts to achieve economic growth at any cost, combined with delays in improving the situation.

As Beijing continues to suffer through its red alert pollution emergency, New Delhi is planning to bring in measures to cut down on pollution.

Fight over who pays for the clean-up of a heavily contaminated area of Auckland's Wynyard Quarter will go all the way to the Supreme Court.

There are few films more environmentally infused than the highest grossing one in history, Avatar - in which a highly militarised mining company seeks to exploit the resources of the rich forest....

Sam Judd hates polystyrene. Hates its smell, its feel, and its effects on the ecosystem and human health. But what can be done about it?

Yes, more can be done and with more urgency, but New Zealand is embracing progress on climate change.

The biggest threat to Auckland's environment continues to come from its own population, according to a stocktake presented to city councillors today.

Dr Tom Trnski, head of natural science at Auckland Museum thinks that our marine systems could recover if humans back off.

Mobil is taking its $10m tank farm pollution fight all the way to the Supreme Court.

High levels of pollution are being emitted by diesel vehicles built by a range of carmakers other than Volkswagen, it has been reported.

Used nappies, beer bottles, takeaway cups, your Herald - all items that are likely to end up in the bin once they're finished with.

I am now convinced that if you want something to change, you have to get up off your critical backside and do something about it yourself, writes Sam Judd.

Today marks D-Day for divers around the country who will recover as much rubbish as they can from the ocean this month as part of the Dive Against Debris effort.

An Auckland school has had to warn its students about rodents in the area after a teenager was bitten when she picked up a dying rat.

I say good riddance to this filthy and dangerous industry, writes Sam Judd. Although I do feel for the workers who will lose out on this situation.

We owe it to our kids to look after this great country and not let them inherit a bunch of overflowing, privately-owned landfills, writes Sam Judd.

Cow effluent charges against two Marlborough farmers have been proven.

Auckland's Harbour Bridge set for radical change as cycling and walking attachment gets resource consent.

Environment researchers have made fresh calls for a tax on polluters on the back of an OECD report highlighting rising pressures on our green backyard.

Earth has entered its sixth mass extinction with animals dying out at 100 times the normal rate, scientists have warned.

Hayden Smith and Ben Harris have been removing rubbish from the Waitemata Harbour for over 12 years, writes Sam Judd. Rain or shine, they are out there.

Car batteries, coffee cups and condoms - welcome to the underwater junkyard that lies just off our city beaches.

Two Auckland men met about two years ago and in that short time they have discovered they have the same passion - cleaning up waterways.