While the delta variant of the coronavirus continues to push cases in the UK ever higher, other variants are continuing to make their way around the world. The lambda variant, which was first identified in Peru, has already spread to 29 countries. Tara Hurst, an expert in how viruses evade immunity, explains what we know about how dangerous lambda is likely to be.

Is a pescatarian diet much better, ethically speaking, than a carnivorous one? Fish are living beings after all, just like cows, chickens and pigs. But philosophers who’ve pondered this question throughout history have often made a distinction. By and large, they’ve sided with the pescatarians.

Plus we learn the potentially greener alternatives to bitcoin that could prosper as concerns mount over how much energy the cryptocurrency uses.

Clint Witchalls

Health + Medicine Editor

Paolo Aguilar/EPA

COVID: lambda variant is now in 29 countries, but what evidence do we have that it’s more dangerous?

Tara Hurst, Birmingham City University

The lambda variant ripped through Peru and is now spreading globally. But there is little evidence that it is more dangerous than the original variant.

Andreea Tudor/Shutterstock

Pescatarians are right – why I say eating fish is more ethical than eating meat

Martin Cohen, University of Hertfordshire

Pescatarians might frustrate purist vegetarians, but the issues surrounding fish are quite different to meat.

24K-Production/Shutterstock

Bitcoin alternatives could provide a green solution to energy-guzzling cryptocurrencies

Sankar Sivarajah, University of Bradford; Kamran Mahroof, University of Bradford

Some alternative cryptocurrencies, called 'altcoins', demand far less electrical power than bitcoin.

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