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Trade volumes remain subdued, while a range of new financial instruments have emerged to assist the rise of renewable energy projects. The STC market enjoyed solid pricing across April.

Sanjeev Gupta signs contract with Neoen to use new solar farm to power Laverton steel mill in Victoria and slash costs. Turnbull and Macron were on hand to witness signing, and the promise of a cheaper energy future via renewables.

Scientists and public health experts say Trump administration’s bid to undo pollution rules are ‘extremely counterintuitive and worrying’

America’s leading cities have some of the cleanest urban air in the world but huge advances made in reducing smog are in danger of falling backwards, experts are warning.

New Yorkers breathe air that is 800 times less polluted than Delhi’s and twice as clean as in London and Berlin, the World Health Organization reported.

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London scientist Tom Pike is looking forward to InSight, Nasa's new mission to the Red Planet.

Charlie Veron's team have compiled a major information base called 'Corals of the World', which is used by more than 20,000 researchers and scientists across the world.

Officials say frogs caught at city’s Audubon zoo could soon pose a threat to native frogs across the Mississippi river

Invasive, noxious Cuban treefrogs that eat smaller frogs and grow as big as a human fist have established a population in New Orleans, and officials say they could soon pose a threat to native frogs across the Mississippi river.

The US Geological Survey says frogs caught at the Audubon zoo in the city and at a nearby riverfront park are the first established population of Cuban treefrogs on the US mainland outside Florida, where they’ve been multiplying at least since the 1950s.

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Rich cities have improved, but pollution in poorer countries is still rising and kills 7 million people a year globally, WHO data reveals

Pollution inequality between the world’s rich and poor is widening, according to the latest global data from the World Health Organisation (WHO) which shows that 7 million people – mostly in developing nations – die every year from airborne contaminants.

Overall, nine in 10 people on the planet live with poor, even dangerous, air, says the WHO report, which is considered the most comprehensive collection of global air quality data. But levels of contamination vary widely depending on government actions and financial resources.

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A daily summary of our news plus bite-sized updates from around the world.

Australia has always suffered heat and flood, but a detailed seasonal rainfall reconstruction of the last 800 years shows the extremes are intensifying. Mandy Freund, PhD student, University of Melbourne Ben Henley, Research Fellow in Climate and Water Resources, University of Melbourne Kathryn Allen, Academic, Ecosystem and Forest Sciences, University of Melbourne Patrick Baker, ARC Future Fellow and Professor of Silviculture and Forest Ecology, University of Melbourne Licensed as Creative Commons – attribution, no derivatives.

New York's Integrating Public Policy Task Force (IPPTF) on Monday published its latest report on how the state could impose a carbon price within its wholesale electricity markets, detailing measures to address possible emissions leakage and ratepayer burdens.

Having conceded defeat in passing a cap-and-trade bill in Oregon this year, one of the state's highest profile carbon pricing proponents is working with lawmakers through the rest of 2018 to again prepare for a renewed legislative push next year.

• Pruitt announces departures of Nino Perrotta and Albert Kelly
• ‘If I were the president, I’d get rid of you’: Pruitt lacerated at hearing

Two top aides have resigned from the Environmental Protection Agency (EPA) amid a growing series of federal ethics investigations, Scott Pruitt, the agency chief, announced on Tuesday.

Related: Trump tells EPA chief Pruitt 'we've got your back' despite ethics controversy

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We are looking for candidates who possess excellent work experience, particularly in climate mitigation and related economic and social issues in developing countries.

As wild wolves return to Europe, one of the first wolves to settle in Denmark has been shot dead in an incident captured on film

One of the first wild wolves to roam free in Denmark for 200 years has been shot and killed, threatening the survival of the species in the country.

Two naturalists who were observing the wolves captured the moment the animal was shot on camera. The film has sparked outrage.

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Power sector emissions capped by RGGI rose by 22% in Q1, spurred by a colder winter in the northeast US and bucking a three-year drop.

EU carbon prices dipped on Tuesday in a rare auction-free session that was relatively thinly traded with much of Europe on a public holiday.

Sounds from the Great Barrier Reef have got quieter over the past five years.

All England Lawn Tennis Club ditches plastic straws for this year’s championships

Wimbledon would not be the same without a thirst-quenching Pimm’s, but this year visitors to the annual tennis championships will be served the beverage without the customary plastic straw.

The All England Lawn Tennis Club announced on Tuesday that no plastic straws would be used in its bars, cafes and restaurants during this year’s Wimbledon fortnight.

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Opponents of cull say cost of £1,000 per animal killed means it is wasteful as well as cruel

The cost of policing the controversial badger cull in just one of the 21 zones last autumn approached the £1m mark – the equivalent of more than £1,000 for every animal killed there.

Objectors to the cull described the bill for Cheshire as a horrendous waste of public money and called for the policy to be scrapped on economic as well as animal cruelty grounds.

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The promotion of carbon markets by business groups including IETA has been labelled a “dangerous distraction” to climate action by transparency campaigners seeking a more clearly-defined structure for accessing UN climate negotiations.