Gatwick’s second runway is yet another example of the tragedy of the commons (Gatwick given green light for £2.2bn second runway plan, 21 September). While all nations benefit from a healthy climate, each also benefits from actions which damage the climate. Only international cooperation – including a binding agreement to phase out fossil fuel production – can prevent this tragedy.
Dr Andrew Bodey
Oxford
• It would be far more helpful, to the widest possible number of people, if Donald Trump were to disclose what he is taking (Trump attacks Tylenol as officials unveil highly contentious conclusions on autism, 22 September). Then we could all avoid it.
Neil Blackshaw
Alnwick, Northumberland
