I suppose that by now most people will understand – well, most people outside the White House – that one of the most serious problems that climate change will bring is unpredictability. How do you grow crops, if you don’t know when to plant them? Though of course this only a worry for those of us who actually eat food.

A few days back I was talking to someone who grew up on the banks of the Winterbourne. If you don’t know it, it’s the stream that runs (occasionally) between the town of Lewes, and its extramural suburb, Southover… 
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