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Blackened marks and other signs of damage on the steel structure suggest that arcing occurred, sending electricity through the equipment that was supposed to have been unused, according to their lawsuit.

Shopping around, or cancelling unused subscriptions are a good start, experts say.

You can also use a pastry brush or a clean, unused paintbrush to dust off the surfaces.

It is possible to add monitoring capabilities to existing fibre optic cables if one unused, "dark" fibre is available, or a lit fibre with enough free channels, the firm adds.

To reduce those emissions, Carnicycle has started a recycling programme, collecting unused costumes that would have been dumped or burned by masquerade bands, which use new costume designs every year.