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Rodrick Ngulube was shot by poachers in West Petauke game management area, after rangers discovered carcasses of a warthog and zebra

At 7am on 12 February, 37-year-old wildlife ranger Rodrick Ngulube was gunned down by poachers in Zambia’s West Petauke game management area. Ngulube and fellow rangers had been tracking seven poachers since the night before when the incident occurred. The slain ranger is survived by his wife and seven children.

The sound of a gunshot the day before had set off the team of six rangers, including Ngulube, to track down its source. Forced to give up the search when it got dark, the team picked up the poachers’ trail again the next morning until they discovered the carcasses of a warthog and zebra.

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Scientists have discovered the river reef is far bigger, and more important, than first thought – a biodiversity hotspot on a par with the Great Barrier Reef. Now they face a race to protect it from big oil

There is a flickering, bright glimmer of sky as the two-person submarine descends beneath the muddy equatorial waters to a place no human has ever seen – a vast, complex coral reef at the mouth of the world’s greatest river.

Thirty metres under the murky plume of the sediment-heavy Amazon, the sub enters a darker, richer world. A school of curious remora fish approaches the two-tonne machine. Crabs and starfish loom in its eerie lights. A metre-long amberjack swims past, then a two-metre ray.

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The international competition to drive innovation in seafloor mapping announces the teams that will take part in its semi-final stage.

Billions of tiny plastic lentil-sized pellets can be spotted on UK shores - but how do 'nurdles' get there?

Owners of more polluting cars will have to pay extra levy from October to drive within congestion charge zone

Older, more polluting cars will have to pay a £10 charge to drive in central London from 23 Octoberthe city’s mayor, has said.

Confirming he would press ahead with the fee, known as the T-charge, Sadiq Khan said: “It’s staggering that we live in a city where the air is so toxic that many of our children are growing up with lung problems. If we don’t make drastic changes now we won’t be protecting the health of our families in the future.

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Scientists are calling for more people to donate their brains to research to help find cures for mental and psychological disorders.

Researchers in Cardiff develop a new "highly-efficient" method of extracting disease-fighting compounds.

Almost entirely submerged, Zealandia meets all the criteria to be considered a continent, say researchers.

Mexborough, South Yorkshire No longer ‘more or less solid chemicals’, the gunmetal waters of the Don are clean enough for salmon

There were wisps of snow in the liverish sky over Main Street, Mexborough. I passed a shop offering cash for clothes, 40p a kilo, across the road from a tattoo parlour, and then stopped outside its shuttered neighbour. This was, from 1938, the family home of Ted Hughes. The poet’s parents ran it as a newsagent’s.

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They say they are lacking the brains of people with disorders such as depression and PTSD.

The designers of the scheme Labor has embraced to meet climate targets admit it is designed to promote gas, not wind or solar – even with a 50% emission reduction target.

Victoria's Labor government calling for expressions of interest to build 20MW battery storage array, to improve grid stability.

Research institutions want to make it easier for scientists to collaborate and share facilities.

SimpliPhi Power CEO in talks on battery storage with Australia's "progressive" utilities and transmission companies.

Why were certain areas rolled out before others? what packages should you get? What do you do if the speeds don't live up to what you were sold? Kelly Stevens from NBNCo joins us in studio to answer all of your questions.

Australia's premier financial regulatory body has delivered a stark warning to the country's politicians, saying that climate change already poses "system-side" financial risks.

The rules of Australia's energy markets were written at a time when coal and gas were the only major options.

Queensland's 25MW Barcaldine solar farm has been bought by one of Europe’s leading solar infrastructure investment teams, Foresight Group.

EnergyAustralia signs third PPA in 3 months, this time a 13-year deal for all the electricity generated by Victoria's 60MW Gannawarra Solar Farm.

Great Winter Nurdle Hunt finds thousands of pellets used in plastic production washed up on shorelines around country

A search of hundreds of beaches across the UK has found almost three-quarters of them are littered with tiny plastic pellets.

The lentil-size pellets known as “nurdles” are used as a raw material by industry to make new plastic products.

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