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India's battle with coronavirus shows that what happens in one part of a globalised world has the potential to disrupt life in other, seemingly distant parts ( 5 June, p 9 ). The same may be true for that corner of the world for climate change. Under the business-as-usual scenario, people there will see glaciers …

Philip Ball's article on strange chemical bonds brings to mind Nick Lane's description of the ultimate molecular nanomachine, ATP synthase, in his book The Vital Question ( 22 May, p 44 ). These exquisite protein motors spin at 100 revolutions per minute, converting adenosine diphosphate to the triphosphate. The machines are the means of generating …

Any trees or other biomass used for "bioenergy with carbon capture and storage" have already captured carbon from the atmosphere ( 5 June, p 13 ). To burn such crops and apply an energy-intensive process to sequester the carbon dioxide and store it, which carries the risk of future release of the gas, is either …

In our look at a quantum internet ( 29 May, p 36 ), we should have said that internet encryption schemes often rely on factorising the product of large prime numbers.

One group of ultra-processed foods to which you paid little attention was meat substitutes. Unlike stereotypical junk foods, soya "meats" are typically high in fibre and protein and low in carbohydrates and fat, but are generally higher in salt than meat. As more people move to a vegetarian or low-meat diet, perhaps the environmental benefits …

You highlighted the debate about the detrimental effects on our health of ultra-processed foods. I wonder whether the extolling of gourmet meals in restaurants and the emphasis on deliciousness promoted in cookery programmes on TV are equally to blame for the rise of obesity and related health issues. I grew up in the 1950s and …

You used the phrase "dangerously delicious" to headline your article on junk food. But junk food isn't particularly delicious, although it does appear to be addictive. Let's see what happens when we try to convince people to eat less processed food. The fight put up by the tobacco industry to counter the science on the …

It is time to stop throwing around the term "junk food". If it is supposed to mean any food that isn't good for you, then people generally don't know which foods are good for them and which aren't. Besides, any food is good for a person who is starving. If it is supposed to mean …

Your article raises the mantra of a shift to greater urbanisation 12 June, p 42 . Yes, greener cities could have huge benefits in a world with increased urbanisation, but covid-19 has highlighted the risks of pandemics spreading rapidly in crowded areas; there will be more to come.

You say that in spite of awareness-raising efforts, stigma and mistrust are still key reasons why people don't seek mental health treatment ( 12 June, p 25 ). Sadly, there is almost nowhere in the world one can go to escape such stigma.