Earlier this summer I blogged about High Impact, Low Frequency events, unlikely occurrences but which could knock out the power grid. It sounds fanciful, but it's a real issue - dangerous electro-magnetic pulses could be caused by solar flares, electro-magnetic storms or by man-made nuclear explosions at high altitude.
So, very pleased to hear Radio 4's Today Programme covering this topic today, with an interview of Avi Schnurr at the EMP Coalition. It's a risk we face that didn't exist a hundred years ago. The interview has not been posted yet, but should appear soon on the i-player (but for UK internauts only I believe).
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