Is “Earth Hour” meaningful, or just a stupid gimmick?

Ottawa Parliament Hill during Earth Hour 2008 (photo by David R Carroll - CC-BY)Earth Hour is a campaign to get everyone to switch off their lights for one hour. The 2009 Earth Hour runs from 8.30 to 9.30pm in everyone’s local timezone, on Saturday 28 March. But what’s the point? The organizers paint it as “the world’s first global election, between Earth and global warming”. They aim to [more...]


Which forms of energy count as green energy?

Wind power at Altamont Pass (photo by Kevin - CC-BY)Green energy is a somewhat nebulous term, but we’ll take it to refer to energy sources that are carbon neutral, and are replenished naturally within timescales of the order of a human lifetime. That gives us quite a few sources of green energy. Hydro power harnesses the energy of moving water. This can take the [more...]

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