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More than 3.5m of the invasive rodents live in Britain, and their presence is harming the welfare of their native red cousins. Luckily, HRH has a cunning plan to reduce their numbers

Name: Grey squirrels.

Age: First introduced to the UK in the 1870s.

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Campaigners write to chancellor to urge him to end tax breaks and bring in scheme to encourage switch to greener cars

Ministers are coming under growing pressure to remove tax incentives for diesel cars and offer compensation to motorists so they can swap to more environmentally friendly vehicles.

A group of medical professionals, environmental campaigners and lawyers has written to the chancellor ahead of the budget to demand a change to the vehicle excise duty that they say subsidises diesel cars.

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New study by ANU suggested a 100% renewable energy grid, with 90% of electricity coming from wind and solar, will be cheaper than a coal or gas-fired system in Australia.

In a statement, Hibatullah Akhundzada says more trees are needed "for the beautification of Earth".

The salad shortage focused attention on the failures of our 24/7 dietary culture. But it also provides a chance to rethink the way we eat fresh fruit, veg and green leaves

I’m afraid the lettuce shortage was just the tip of the iceberg. We may have run low on salad leaves but, more worryingly, we were low on empathy for poor southern Spain where flash floods followed by snow wrecked the crop. Our relentless consumer-rights focus meant that the emphasis was clearly on “weather-related supply challenges”, supermarket speak for “My God, we are running out of salad!” Sustaining a dietary culture of 24/7 access to all fresh fruit and veg in all seasons was never going to be easy.

A packed salad uses at least 10 times more energy than a local lettuce

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More than £17m will be made available for robotics research carried out by British universities.

Head of the EPA told the conservative audience they would be ‘justified’ in believing the environmental regulator should be completely disbanded

Scott Pruitt, the administrator of the Environmental Protection Agency (EPA), has vowed to roll back flagship regulations that tackle climate change and water pollution, telling a conservative audience in Maryland they would be “justified” in believing the environmental regulator should be completely disbanded.

The Trump appointee signalled that the president is set to start the work of dismantling climate and water rules as early as next week. Pruitt said the administration will “deal” with the Clean Power Plan, Barack Obama’s centrepiece policy to reduce greenhouse gas emissions, and the Waters of the United States rule, which gives the EPA wider latitude to reduce pollution of waterways.

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Simon Chapman AO says there's never been a more important time for researchers all over the world to speak up about their work — its implications and how societies and governments should act on it.

Scientists at Vatican conference are searching for a solution to the manmade ‘major extinction event’

One in five species on Earth now faces extinction, and that will rise to 50% by the end of the century unless urgent action is taken. That is the stark view of the world’s leading biologists, ecologists and economists who will gather on Monday to determine the social and economic changes needed to save the planet’s biosphere.

“The living fabric of the world is slipping through our fingers without our showing much sign of caring,” say the organisers of the Biological Extinction conference held at the Vatican this week.

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When Common Agricultural Policy payments come to an end, what will they be replaced with? And what should that be spent on?

Compared to most industries subject to the ups and downs of global markets, farming is a cottage industry. Where mining has a few operators dominating the scene, agriculture involves thousands of producers in each country.

That simple fact works against the high levels of investment agriculture minister Andrea Leadsom would like to see in the run-up to a hard Brexit.

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The island that inspired the National Trust has finally been gifted to the conservation charity.

Achvaneran, Highlands The tracks went straight down the garden, through the fence and over the burn with one leap. It knew where it was going

The previous night’s snowfall had been just right for tracking: about 4cm at dusk, then no more until after light. So I was out early and picked up the first tracks under the beech tree at the bottom of the garden, a stoat. It had been quartering the ground, hunting, but did not make a kill until it reached the large pond. There the tracks suddenly veered; a leap sideways and a few specks of blood on the snow revealed where it had taken its prey, probably a mouse or vole.

Related: Daylight encounter hungry pine marten

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The UN’s new climate chief says she is confident, despite concerns about President Trump's policies.

A school girl in Boston has found use for the fibreglass backing used in circuit boards which currently is not recycled and adds to poisonous leaching from landfill.

Seagrasses produce oxygen, absorb large quantities of carbon dioxide, and now have been shown to cleanse water of bacteria.

Transport secretary recommends low-emission cars after it emerges that thousands of children breathing toxic air

Drivers should “think long and hard” before buying a diesel car and instead consider purchasing a low-emission vehicle, the transport secretary has said, as the government considers a strategy to tackle air pollution.

Chris Grayling’s intervention took place as the Guardian revealed that tens of thousands of London’s children were attending schools in areas with levels of toxic air in breach of EU legal limits. The minister also said the government had a legal duty to cut emissions of nitrogen oxide from diesel cars, which account for four in 10 vehicles on British roads, after a high court ruling in November ordered the authorities to reduce levels of the toxic fume in the “shortest possible time”.

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One was caught in 2010. Just one. A tiny, nine centimetre long mouse, with whiskers like a spray of fireworks and a white, fluffy belly. Since then, none.

Lake Cowal in New South Wales is home once again to thousands of waterbirds; meet a young winemaker with a real connection to the earth; and UK farmer Jim Chapman spreads the farm-safe message.

Squirrel cull | Housebuilding | PPE and LSE | More leftovers | La La Land

The easiest way to protect the red squirrel (Report, 24 February) is for us to eat the grey ones. The latter are too plentiful and should be easy to trap. Many of us have no problem eating rabbits, so the greys could be a cheap addition to our diet. The bird population would also benefit from a cull of these pests. So, Delia, could we please have a recipe for écureuil à la bourguignonne?
Donald Blow
Kirkcaldy, Fife

• John Harris (What’s the point in building a million new homes if they’re not fit to live in?, 22 February) writes honestly of the difficulties facing new home owners when the rush to build leads to corners being cut. We are also aware of houses being sold leasehold, some with onerous clauses which double ground rent every few years. Caveat emptor.
Brenda Banks
Teignmouth, Devon

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The simple up-and-down motion of hand pumps could help scientists secure a key water source for 200 million people in Africa.