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Scientists and engineers have pumped 300 litres of simulated whale poo into the ocean off Sydney as part of efforts to snag a share of Elon Musk’s US$100m prize for capturing and storing carbon.

The team, known as WhaleX, carried out its first open-ocean experiment on Sunday about eight kilometres off Port Botany in New South Wales after gaining clearance from the federal government.

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The Guardian and Observer’s 2021 charity appeal is fighting for climate justice. In this video, we meet some of those on the climate frontline, and the charities helping them. This year we are supporting four charities - Global Greengrants Fund UK, Royal Botanic Gardens, Kew, Environmental Justice Foundation, and Practical Action - that fight to protect the rights and livelihoods of communities hit by extreme weather events caused by the climate emergency.

• Donate to our charity appeal here

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The ACT government has issued its call for potential proponents to deliver its 250MW Canberra Big Battery.

The post ACT seeks to create short list for 250MW Canberra Big Battery project appeared first on RenewEconomy.

Big thanks to all our readers, advertisers, sponsors, contributors, commenters and the hundreds of individual donors for your support and inspiration in 2021.

The post RenewEconomy is taking a short break. See you in 2022 appeared first on RenewEconomy.

The Federal Court has struck a blow to the Morrison government's gas expansion plans, ruling $21 million in Beetaloo gas drilling grants are invalid.

The post Federal Court voids Beetaloo gas drilling grants, ruling they are legally invalid appeared first on RenewEconomy.

Renewable hydrogen must get its costs down to be competitive. But Stanwell is in the box seat for hydrogen projects in Australia.

The post Why Stanwell has the most bankable renewable hydrogen project in Australia appeared first on RenewEconomy.

Solar taxes, solar switch-offs, 100 per cent solar, amazing technology cost predictions and some stunning innovations. And it all happened in 2021.

The post Solar Insiders Podcast: The highs and lows of 2021 appeared first on RenewEconomy.

Big win for virtual power plants - including rooftop solar, batteries and EVs - as AEMO adjusts proposed changes to metering speeds.

The post Big win for virtual power plants as AEMO backs off on metering changes appeared first on RenewEconomy.

When too much wind and solar is not nearly enough! What does a grid look like when it is nearly 100 per cent powered by renewables?

The post Australia is racing towards 100 per cent renewables. What does that look like? appeared first on RenewEconomy.

Korea Zinc buys wind and solar developer Epuron, delivering a wind and solar portfolio of up to 9GW for its green metals and hydrogen ambitions.

The post Zinc giant buys wind and solar developer in major green metals and hydrogen play appeared first on RenewEconomy.

Australia has thousands of beaches which differ greatly, from huge tides to high energy to recurring sinkholes. Hannah Power, Associate Professor in Coastal and Marine Science, University of Newcastle Licensed as Creative Commons – attribution, no derivatives.

WA's biggest solar farm delivers a capacity factor of 40 per cent for the month of November, which will have pleased its new owners.

The post West Australia’s biggest solar farm sets top performance benchmark for new owners appeared first on RenewEconomy.

Scientists uncover evidence for a large-scale, prehistoric migration into Britain in the Bronze Age.

Spain's BlueFloat and Energy Estate to develop at least three offshore wind farms, totalling 4,300MW in waters off NSW and Victoria.

The post Spain’s BlueFloat eyes 4.3GW of Australian offshore wind projects, with more to come appeared first on RenewEconomy.

Elephant seal mums can distinguish their own offspring at just two days old, research shows.

Researchers say the fossil is at least 66 million years old and was about to hatch just like a chicken.

No country has a higher diversity of sharks than Australia. That means we have a special responsibility to protect them. Peter Kyne, Senior Research Fellow in conservation biology, Charles Darwin University Licensed as Creative Commons – attribution, no derivatives.

Revellers in England and Ireland mark the shortest day of the year and official first day of winter

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2021 was another extraordinary period for news and investigations, in the Guardian's 200th anniversary year. Twelve months of Covid stories ranged from the hope of vaccination through to government mismanagement. It was also the year of Cop26, with world leaders and activists gathering in an attempt to slow the climate crisis. 

There were protests against injustice, including those about violence against women in the UK. It was also a year of global political shifts, not least in Afghanistan. Meanwhile, it was a year of sporting inspiration in Euro 2020, the Olympics, and Emma Raducanu's improbable US Open victory. 

Here are some of the highlights of our journalism over that time.

• Show your support in our 200th year for the Guardian’s powerful, open, independent journalism in 2021 and the years ahead

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Plan B Earth group argued ministers had not taken ‘practical and effective’ steps to reduce emissions

An environmental campaign group that challenged the lawfulness of the UK government’s climate policies has lost a high court fight.

Plan B Earth argued that ministers had not taken “practical and effective” steps to reduce greenhouse gas emissions. It wanted Mr Justice Bourne to give activists the go-ahead for a judicial review but he refused to grant permission.

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