Earth Hour once again comes around in its 3rd year and now 3,000 cities and towns in over 90 countries are participating with the support of the United Nations. The actual level of carbon emissions saved by switching off for 60 minutes is very small however the need for constant consciousness in order to encourage policy action should not be underestimated. The chronic need for wide agreement between nations and major polluters at the Copenhagen conference this year is essential if some possibility of mitigating the most extreme effects is to be achieved.
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