Butterfly effects
Under such headlines as ‘British butterfly defies doom prediction to thrive in changing climate’, the usual suspects (e.g. the Guardian and the Independent) recently publicised a study claiming that, thanks to global warming, ‘a once-rare British butterfly’, the Brown Argus, ‘is becoming a common sight in the English countryside’. A paper from York University, it was reported, showed that these butterflies have moved so far north that they can now be seen ‘within a few miles’ of York. Not for the first time on reading similar claims, I wondered how it is that their authors seem to know so little about butterflies, My battered copy of the best book on
