PM says new resolve on climate change and trade for Commonwealth leaders.

Marine heatwaves are growing longer, stronger and more frequent thanks to climate change.

Kiwis may not know they just lived through an event freakish even under climate change.

Temperatures were more than 2C above average in our summer of extremes.

The incident is captured in world first footage.

Two green sea turtles, Oscar and Kiwa, have been released into the ocean after being rescued from 90 Mile Beach almost two years ago.

Two green sea turtles have been released after being rescued almost two years ago.

Kiwi scientists return from Antarctica with important new climate-change insights.

During ancient climate change, our oceans lost their oxygen, a NZ-led study finds.

During Earth's last big warming cycle, something dramatic happened in the Southern Ocean.

An East Coast waka voyage has encountered a surprising amount of ocean plastic pollution.

Number of NZ sea lion pups on subantarctic islands falls 40 per cent in just 20 years.

What impact is dumped rubbish having on our marine life?

What could be a record summer has come with warmer water that "revved up" Cyclone Gita.

Nicky Sinden wants people to head down to their local beach on Sunday for a clean-up.

The Underwater Photographer of the Year 2018 has just been announced.

Crayfish quotas are not allowing the fish to survive in northern waters.

He described the moment as "beautiful" and "other-worldly".

Boaties had an incredibly close encounter with orca at Ponui Island near Waiheke. Credit: Jitske Braaksma

A pod of dolphins played with holiday goers in the Bay of Plenty in the second sighting in two days. Credit: Ella Southward

Microplastic particles polluting Earth's oceans now found in Antarctica's pristine waters.

People in Auckland continued to swim at Milford Beach despite a health warning being put in place after raw sewage contaminated the water.

The last time summer was running this hot, Nazis ran Germany. What's been the difference?

Plastics in the oceans are killing corals by increasing their risk of becoming diseased.

Passengers on board Auckland Whale & Dolphin Safari were in for a rare natural show on Tuesday when they discovered a whale carcass complete with feeding sharks floating north-east of Waiheke Island. / Footage supplied by AWADS.

How are oceans faring with pollution, fishing and climate change? Simon Thrush explains.

Odd behaviour among snapper this summer has been put down to a lingering marine heatwave.

NZ is being urged to help create the largest protected area on the planet.

Record "marine heatwave" could fuel a low-pressure system forecast to hit NZ next week.

They're called dead zones - patches of water that kill life - and NZ isn't immune to them.