Editor's note

Avoiding dangerous climate change is possible – but expensive. That’s the conclusion of a new study led by legendary climate scientist James Hansen. He argues that we’ll need to take carbon directly out of the atmosphere and any delays will only add to the cost. We are leaving future generations with an impossible financial and technological burden, says James Dyke.

After decades of debate, the 13th Doctor Who will finally be female. The BBC announced that Jodie Whittaker, well-known for her role in the popular thriller Broadchurch, will take the helm of the TARDIS. It’s thrilling news for Una McCormack, who has written several Doctor Who books and has long lamented the lack of leading women in science fiction. Meanwhile, Vicky Neale salutes the memory of Maryam Mirzakhan, the first and only woman to win the Field Medal, the most prestigious prize in mathematics.

If sugar is evil – blamed for the global obesity epidemic – then low-calorie sweeteners must be saintly. Not so, says Rachel Adams. A large-scale review of studies suggests that low-calorie sweeteners won’t help you manage your weight and may even increase your risk of diabetes and heart disease.

Will de Freitas

Environment + Energy Editor

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24Novembers / shutterstock

Inaction on climate change risks leaving future generations $530 trillion in debt

James Dyke, University of Southampton

New research calculates the huge cost of 'negative emissions' technologies that will be required to avoid dangerous climate change.

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