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Referring to our study "Inverse modelling of national and European CH 4 emissions using the atmosphere zoom model TM5" by P. Bergamaschi et al ( Atmospheric Chemistry and Physics , vol 5, p 2431), Fred Pearce reports that "Now two teams that have monitored concentrations of greenhouse gases in the atmosphere say they have convincing …

Considering the charges that may soon be levelled at Andrew Wakefield, the doctor who published research showing an association between autism in children and the MMR vaccine, Â鶹´«Ã½ is surely right to defend the general principle that doctors should be free to voice their concerns (17 June, p 5). But along with that freedom …

I was surprised to note that the authors of Comment and Analysis take such a dim view of magic and such an elevated view of the role of Christianity in the development of science ( 24 June, p 25 ). Sir Isaac Newton's interest in various occult subjects is well known. Most of the magicians …

John Harris says that there are "no victims, no rights are violated nor interests compromised" by the wide-open reproductive choices he propounds (17 June, p 24). We can argue about when the embryo acquires its own rights, but Harris's baby will arrive with a prior and overwhelming expectation of perfect health and even specific physical …

Celeste Biever reports on the threat to net neutrality posed by big telecoms companies (24 June, p 30). The one thing missing from the report was the issue of "dark fibre". I think it is fair to say that most telecoms companies use fibre-optic cable these days rather than copper cable, and when they lay …

Troy Barston thinks physicists are asking questions which are too esoteric for practical use and suggests a "white paper" to decide the direction of research (17 June, p 26). This misunderstands the nature of fundamental scientific research and the breadth of physics. It is unfortunate that in the popular mind physics frontiers are limited to …

You suggest that "If one half of an entangled pair of particles were to cross the event horizon and disappear into the singularity while the other did not, then this entanglement would be destroyed" (10 June, p 34). Why should it? Since other manipulations of one half of an entangled pair result in a corresponding …

Having inadvertently dropped a UK edition of Â鶹´«Ã½ in the bath and then repeated the same mistake in New Zealand, I can verify that the Australasian version can be dried out and remains readable, unlike the soggy papier mâché that the UK edition is reduced to. Different paper rather than different content, I assume.

• Chris Mason of University College London was incorrectly referred to as Chris Major in the news item on stem cells from blood (24 June, p 18). • Our article on "faster" vaccines stated that "For each amino acid, there are up to four possible codons" (3 June, p 16). Reader Keith Bradnam points out …

According to the information disseminated by Ely Cathedral in the east of England, King's College Chapel's fan vaulted roof in Cambridge and the even wider one over the Lady Chapel of Ely Cathedral were built as learning exercises for the building of such a roof over the nave of the cathedral, which is wider still …

I would like to add a few stark figures on the availability of vaccine for H5N1 influenza (17 June, p 10). If every factory producing the current vaccine based on hens eggs is working, there will only be enough to protect 112 million people each year from a global population of 6500 million. Although we …

I was disappointed to see that while the magazine's cover art gave a breathtaking image of an eco-friendly metropolis, complete with people-carrying tubes and exciting wind turbines modelled into skyscrapers, the accompanying articles suggest that the only way forward is to abandon the idea of high-rises completely and move to less dense "medium-rise" buildings (17 …

Bill Joy highlights real concerns with the proliferation of ever more powerful technologies (17 June, p 54). However, his suggested solutions seem somewhat naive. His argument is founded on an implicit distinction between "us" and "malign individuals" – but that is obviously never a clear divide. Can we really be confident that the "us" he …

In the article about Barentsburg in Svalbard I read that "Last summer, it rained for the first time in living memory" (17 June, p 56). I must wonder whether Barentsburg is blessed by a surprisingly dry microclimate, or whether living memory doesn't go as far back as the summer of 2003, because back then I …