The optimistic organizers are hoping one billion people will switch off their lights tomorrow at 8:30 pm [your] local time. All sorts of different towns, cities and businesses are taking part. For just one example, tomorrow night's LA-Nashville hockey game is being played early so as not to conflict with the hour of darkness.

It is a gimmick, sure, but a surprisingly effective one. Last year, Earth Hour led to a measurable drop in electricity demand in participating Canadian, Australian and New Zealand cities last year. That won't solve climate change. It does at least make people think. A poll taken after last year's Earth Hour showed a majority of Canadians - across party lines - think it should happen more often.

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