I've just thought of a new game for bored teenagers that could rival the annoyance of trick-or-treat and carol singing.

During earth hour, kids could run up drives and into gardens to activate the security lights. With a little bit of co-ordination is should be possible to keep whole streets floodlit throughout the 60 minutes.

If people started to disable the security lights to thwart the game, a few well chosen words in the right places about burglars would create enough paranoia to make sure they were working for next year.

DC