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In your article about people in what is now Chile who maintained memories of coastal threats for 1000 years, you quote Eugenia Gayo on her belief that people "usually have a short memory" for events like tsunamis, and that maintaining behaviour linked to such memories for 1000 years "is a lot" ( 16 April, p …

You report the truly frightening destruction of the Amazon rainforest, which seems to be aided by the actions of Brazil's president ( 9 April, p 20 ). Perhaps environmental protest groups in the UK, like Extinction Rebellion, could make an impression by blockading the Brazilian embassy instead of disrupting ordinary citizens' lives.

A strategy to halt the deforestation of the Amazon is to encourage a blanket ban on the import of all products sourced from the Amazon. This could be done via the COP27 climate summit. This would have the additional benefit of promoting a drastic reduction in beef cattle ranching, which would lead to significant greenhouse …

It shouldn't be a surprise that "ghosting" – ending a relationship by cutting all communication without explanation – is painful ( 23 April, p 47 ). It is often a form of humiliation, which is an exercise of power that is arbitrary or unexpected, involves rejection or exclusion, conflicts with what was thought to be …

The term "lab-grown meat" is unscientific ( 30 April, p 12 ). Meat is animal flesh. Some of us like to eat it, some don't. Those who don't can have a healthy and delicious diet of vegetables. What you refer to isn't meat and would be better described as "synthetic foodstuffs". At the very least, …

After reading your report that exposure to mountain landscapes boosts generosity, Bryn Glover asks if the Swiss are inherently so ( Letters, 16 April ). I believe the answer is yes. For example, on one day in March, an organisation called Swiss Solidarity raised 45 million Swiss francs ($46 million) for Ukraine and this sum …

Aisling Irwin reports that dogs, based on their global impact on wildlife and the environment, can be regarded as an invasive species ( 30 April, p 42 ). We may make things marginally worse by owning pets, but let us get it into perspective. There are far fewer dogs than people and, for the most …

Paul Whiteley asserts that nuclear power doesn't add up for five reasons ( Letters, 30 April ). However, these aren't intractable engineering problems at all, they are bogeys created and maintained by scaremongering, a very human problem. Generating a kilowatt of electricity per person for a year results in only 1 gram of fission products, …

My house has solid walls and I have found insulating them to be prohibitively expensive – a point highlighted by Robert East ( Letters, 30 April ). I was quoted £15,000 for my three-bedroom end-of-terrace property. So I started thinking, could I do it myself? We have a lot of unwanted clothes. Charity shops dispose …

The story on the carbon removal plant in Iceland is one of almost weekly articles referring to carbon dioxide storage as a means of fighting climate change ( 23 April, p 19 ). To have a significant effect, tens if not hundreds of millions of tonnes will have to be stored each year. Could there …