USA PROTECTS POWER GRIDS FROM NUCLEAR DETONATION ABOVE ITS ATMOSPHERE

'Nuclear threat' to power grids
Scientists have warned that Iran and North Korea could produce a weapon capable of paralysing Western electricity grids for months or years.

Experts fear that a missile-launched nuclear bomb exploded above the earth's atmosphere could cause a catastrophe.

They told the British government that high-altitude electromagnetic pulses could lead to an "economic shutdown".

US government adviser Avi Schnurr said efforts to protect the US electricity grid had already begun.

[link to news.bbc.co.uk]