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You report concerns that skyglow – light spilling from cities into rural habitats at night – may affect wildlife ( 2 March, p 8 ). You mention solutions: turning off street lights in the small hours of the morning as well as limiting the brightness of signs and ensuring that the light is directed only …

Graham Lawton lists 18 easy wins in combating climate change, such as more wind turbines ( 23 February, p 40 ). I would like to suggest some more. We could stop feeding livestock with human food crops and instead use crop residues, natural vegetation and spent brewery grain with methane-reducing feed additives. We could grow …

I am surprised your article on easy climate change fixes didn't mention vehicles standing with their engines idling. It irks me to see cars running in summer just for air conditioning comfort, or in winter just for heat.

The eighth item in your list of ways to cut carbon emissions is about "more efficient gadgets", including improving the energy efficiency of electric toilet seats. I would have thought not fitting them with an electric motor, and operating them by hand, would cut energy use significantly.

Amazing band name: transient anus, or warty comb jelly – either would do Vanessa Peters is one of many with this reaction to the news that Mnemiopsis leidyi has an anus that comes and goes ( 9 March, p 8 )

Eric Kvaalen says that the 10,000 Swedes who have forsworn air travel may be getting it wrong, because travelling by car to the same destinations can use more fuel (Letters, 16 February ). He may be technically correct in some cases, more likely for long-haul flights. But fuel use isn't the main issue, global warming …

I was taken aback by Natalie Smith's insistence that surrogate mothers shouldn't be paid ( 5 January, p 20 ). It should actually be one of the highest-paying jobs there is. That is because a woman is sacrificing her body and risking her health in order to help create a family for those who can't. …

Debora MacKenzie reports on gum disease as a possible contributory factor in Alzheimer's disease ( 2 February, p 6 ). My mother-in-law is as sharp as a pin, although her short-term memory is fading. She is 96. When she was in her teens it was decided to remove all her teeth. On what grounds we …

You say a 21st-century Voltaire might think: "I disapprove of what you eat, but I will defend to the death your right to eat it." (Leader, 16 February ). Maybe, but the line this is based on first appears in The Friends of Voltaire (1906) by Evelyn Beatrice Hall, written under the pseudonym of S. …

It might have been better for you not to have told us that AI can potentially identify hotel chains, even maybe individual hotels, from photos of children taken by traffickers ( 16 February, p 7 ). I'm not sure how many traffickers read Â鶹´«Ã½, but if they do, they will surely now take steps …