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Jim Chalmers likes to boast, or marvel, that he is the first treasurer since Ben Chifley to deliver four budgets in a term.

Imagine a world where the oxygen you need changes dramatically between day and night. Your world shifts from being rich in oxygen (oxic) in the day, so you have energy to hunt for food, to suffocatingly oxygen-free (anoxic) at night, which slows you down.

A graph I saw in high school appeared to show the Earth breathing.

Speaking on BBC One’s Sunday With Laura Kuenssberg, Wes Streeting, the UK health secretary, expressed concerns that some mental health conditions were overdiagnosed. The Conversation asked two experts to comment on Streeting’s claim. Is the health secretary right?

Microplastics are hindering photosynthesis, the process by which plants convert energy from the sun into the fruit and vegetables we eat. This threatens massive losses in crop and seafood production over the coming decades that could mean food shortages for hundreds of millions of people.

The latest deadline for countries to submit plans for slashing the greenhouse gas emissions fuelling climate change has passed. Only 15 countries met it – less than 8% of the 194 parties currently signed up to the Paris agreement, which obliges countries to submit new proposals for eliminating emissions every…

A proposed reform to the way electricity is priced in Britain could see households pay a different bill based on their postcode.

Nan Shepherd’s The Living Mountain is not a book about conquering peaks or mapping uncharted terrain. It is instead a deeply felt, poetic encounter with the Cairngorms.

In Philadelphia, fatal overdoses are the No. 3 cause of death after heart disease and cancer. That’s been the case each year since 2016, except in 2020 and 2021 when COVID-19 deaths outpaced overdose deaths. The vast majority of fatal overdoses in Philly involve the synthetic opioid fentanyl.