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We all know the aim to "pursue efforts" to keep global warming to 1.5°C is a lost cause. Your article asks whether the new target should be 1.7°C, 2°C or even stay at 1.5°C, but with a new meaning. None is the right target. It should be 1°C( 26 July, p 8 ). To set …

The majority of climatologists have, since at least the 1992 Rio Earth Summit, been well aware of climate change – that it is real, happening now and mainly a consequence of human activity. Nations, political leaders, businesses and many individuals have widely ignored the warnings. Why does anybody think this will change? It won't, or …

For governments to officially accept that 1.5°C is no longer achievable and that a higher limit must be set would almost certainly have negative consequences. Any excuse to relax decarbonisation efforts or to continue business as usual will result in greater climate catastrophes and is unacceptable.

Stefan Koelsch highlights benefits that music can deliver, but we shouldn't ignore its downsides. We don't all have the same tastes. A genre that one person enjoys will infuriate another. Consider, for example, the thumping bass coming from a car in a traffic queue. Loud canned music has driven me out of shops. Some film …

The big bounce theory has never held any attraction for me. Our universe is expanding as a result of the big bang, and as the fragments of it get further dispersed, the gravitational force acting on them falls. Rather more attractive is a belief that these fragments will all find their way into an infinite …

I was fascinated by the possible funerary practices in hominins previously not considered sophisticated enough for such behaviours. The question as to whether Neanderthals developed their practices or learned them from us is interesting and probably impossible to answer. Either way, it doesn't detract from the fact that they would need sophisticated cognitive abilities just …

This piece leaves me wondering what the motivations may be behind ancient funerary practices. They may well reflect belief in, and ritual worship of, some sort of god or gods, and a belief in, or at any rate a desire for, life beyond death.

Further to Clive Bashford's letter about doing isometric exercises in bed – I do that, too, but concentrate on my left side as, during the day, I do a fair amount of physical work using my right side( Letters, 6 July ).

When it comes to body clocks, researchers should investigate the phenomenon of "second sleep", or biphasic sleep. This is fairly well-known historically and among some anthropologists. It seems to have been relatively common and widespread at a time when people's daily rhythms were largely determined by the sun and when bright indoor lighting was unavailable …

As a child, I asked my father: what is infinity? He said that it was the length of the Forth Bridge as experienced by a mouse. He was an engineer. I have always found that definition most satisfactory( 9 August, p 28 ).