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Chris Mason suggests that within a billion years we will have to leave Earth to escape the effects of a dying sun ( 17 July, p 44 ). We will need to colonise a new planet using a spacecraft capable of supporting successive generations for the voyage. I suggest a postscript, in which the generation …

You report that "monitoring wildlife... might be made easier and cheaper... vacuuming bits of DNA out of the air" (31 July, p 16). Presumably, soon every CCTV camera will have an air sampler attached to detect our DNA. People walking past can expect to get everything from a text suggesting they visit a nearby shop …

In your extended look at how to transform our energy system to a climate-friendly one, nuclear power doesn't make the cut ( 7 August, p 34 ). It should. For starters, Rolls-Royce is leading a consortium to produce small modular nuclear reactors producing about 450 megawatts each. It says that they could be operating in …

The future widespread use of electric cars is an unthinking assumption. Cars are a particularly inefficient mode of transport. Most spend 90 to 95 per cent of the time parked in driveways, car parks and on the road. A traffic jam of electric cars will still happen. A mix of public transport, cycleways and footpaths …

There has long been a negative stance on biofuels, but they don't have to be made from food crops. They can be made from any kind of plant. The main rivals to power transport – batteries for electric vehicles – are not only heavy, but entail an environmental and human cost in production. For example, …

Whatever we do with our energy systems, it is too late to prevent sea level rise. We have to accept that Jakarta, Miami, Bangkok and many other cities, including London's riverside within the next 50 years, are lost causes. While wealthy elites can afford to flee, for billions of poorer people across the globe, we …

The best source of energy we have is the sun and the right place to put solar generators is in hot deserts, where solar strength is great and pretty constant all year. Such a scheme was proposed and costed in 2010 in order to supply energy from North Africa to Europe. It was shown to …

You report climate scientist Tim Palmer's call for a "CERN for climate change" supercomputer project ( 31 July, p 11 ). Why not incentivise the vast computing resources of the cryptocurrency mining community to perform the calculations? Although most mining hardware is targeted at cryptocurrency solutions, this could be addressed. Palmer cites €200 million a …

Jim Watson proposes that there are advantages for many countries to skipping fossil fuels and moving directly to renewable energy supplies ( 7 August, p 23 ). I'm sure he's right about that. He then says that this switch could underpin economic development. But is it not the case that economic development – in other …

In our recent feature on cave art (31 July, p36), the depiction of a kangaroo shown on page 39 was in fact ancient aboriginal rock art at Kakadu National Park, Australia