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One less-discussed effect of human adaptation to rising temperatures could be a change in clothing fashions in some parts of the world, which may have wider repercussions. If we have more very hot and sunny days, will Western fashion begin to lose its appeal? Some may opt for longer, cooler dresses with arms covered, causing …

It has been more than 35 years since I saw it, but seeing Simon Ings recommend the film Threads brought up memories of how horrific this fictional account of nuclear war is. It should be required viewing for all politicians in a country with a nuclear arsenal ( 12 August, p 30 ).

When people ask me (usually in a shocked tone) why I don't carry a smartphone, I answer, half-joking, "because I teach cybersecurity". Amanda Ruggeri's excellent piece on data harvesting is a stark reminder of how this technology is being abused in the name of profit, which makes me feel a little less like a member …

We have all contributed to, and been a witness of, the birth of a now deeply entrenched business model that makes its profits from the creation, use and exploitation of our personal data. To deal with this we need governments to legislate, laws to be enforced, the media to explore, academics to research and civil …

I enjoyed your look at "the hidden powers of gesture". However, regarding the puzzle posed at the beginning – that people who listened to a debate between the US presidential nominees Richard Nixon and John F. Kennedy felt Nixon won it, whereas those who watched felt Kennedy won – there may be an explanation other …

The story on the impact of ancient wildfires was interesting. When it comes to the threat today, most of what we do aims to stop them happening. This preserves fuel for when a wildfire does get going, making it potentially worse. We must think more strategically ( 26 August, p 9 ). Perhaps permanent settlements …

Glenda Dixon asks why we can't use warming oceans as a power source. Inevitable waste heat is the problem. Back in the 70s, a system used the warmth of surface water to vaporise a refrigerant and drive an electricity-generating turbine. The gas was then pumped to the cold depths to liquidise. The result is that …

So spiderlings kept in starvation eat siblings faster than those that are fed. No surprise! What is the purpose of such predictable research? It seems unnecessary and, surely, unethical ( 19 August, p 18 ).

Graham Lawton mentions foods that use most water ( 26 August, p 36 ). Vanilla beans are at the top of the list. A lot are grown in Madagascar, a place where many people live in poverty. This raises a dilemma: should I be supporting their livelihoods or reducing my water consumption?

You stress the thirstiness of coffee, chocolate, tea and vanilla plants, but they are grown in rainforests or in countries with monsoons providing water from rain rather than irrigation. Growing thirsty plants such as almond trees in deserts is bizarre, but taking advantage of abundant rainfall seems like a good idea.