Every day, millions of tons of inadequately treated sewage, industrial and agricultural waste enters the world's waterways, writes Sam Judd.

Sam Judd writes that perhaps the biggest environmental problem we currently face is the contamination of our waterways by nutrients.

The rough seas of the southern Pacific Ocean are set to be the focus of resource consent debate as a mining company's bid to dredge the sea floor comes up against the fishing industry and environmentalists.

One hundred grey shark fins, and one orange fin, are floating in Wellington harbour today to mark the final day of shark awareness week.

Environmental columnist Sam Judd takes a look at the disastrous consequences of the Japan earthquake on our food chain.

Lynn Dao has allowed us to watch her fantastic video. Towards the end of her two week trip in New Zealand, she went with Dolphin Encounter in Kaikora to hop in the ocean and swim with a bunch of dolphins. She thought it was going to be amazing, but nothing prepared her for the surreal experience of swimming with a pod of 500 dusky dolphins!

Environmental columnist Sam Judd checks out the proposed controversial changes to areas for commercial harvesting for paua.

The 2012-13 State Ocean Swim Series, which offered the richest swimming prize in New Zealand history, came to a dramatic finish last weekend with Aussies Ky Hurst and Melissa Gorman sweeping the titles.

Technically, Pink Floyd had it wrong. The space-facing side of the moon isn't dark. Not that you'd know that, given we always see the same side of our nearest neighbour.

It's reaching the business end of the State Ocean Swim Series.

The carbon fibre Solar Impulse plane has the wingspan of a 747 but only weighs as much a Honda Prius.

Could it be that the humble sea urchin has come to the rescue? Sam Judd finds that the latest technological breakthrough for waging war on carbon emissions has the spiny sea creatures to thank.

Up to 900 dolphins have been killed by villagers in the Solomon Islands, who claim it was an act of retaliation for not being paid money they were promised.

A bid that would have safe-guarded the Ross Sea's pristine eco-system with the world's largest marine protected area has failed.

A Facebook campaign about plastic lollipop sticks has forced Chupa Chups to start a project that will change the product to a more sustainable material.

A two-and-a-half year expedition by the ship on which Sir Peter Blake was murdered continues his work under the oceans.

Sam Judd looks at the effect of plastic and toxins on marine life - particularly killer whales.