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A little ditty explaining how electric cars may not actually create more pollution through increased output from powerplants, I've not fact checked this or anything as I'm far too lazy but this is the source.
http://www.ucsusa.org/clean-vehicles/electric-vehicles/life-cycle-ev-emissions#.V1b7IVdrL8s
and this is the vid, only a minute long.
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The price of food is linked to the price of oil atm. Transport is 10% of the top of my head, heating 20%, food also 20% of emissions...
Until there are nuclear / sun / wind cargo ships, and other means to power agriculture (we can keep some oil aside for fertilizer) be careful what you wish for ;)
It's easy enough for Norway to brag about it as they get most of their electricity from hydro-power. If UK were to do the same whilst there are still coal powered electricity plants might only make for fresher air in London, whilst the effect on the planet as a whole could be negative.
It seems easier to me to reduce fossil fuel consumption by singling out and reducing petrol use trough direct taxes, than to reduce driving on coal-generated electricity. A tax on electricity would hit all sorts of users, not only drivers who are too lazy to get on their bikes.