How Low Can You Go?

I've had some fun this morning playing around with the Guardian's newly-released National Carbon Calculator.

The aim is simple - just how much carbon can you save compared to today's levels by implementing the policies that you believe in. Can you keep energy supply and demand in balance if you get rid of all the coal power plants in the UK? What if all cars were electric? Would people still be able to fly, volcano or no volcano?

The government target is to reduce carbon emissions by 80% by 2050. By sheer coincidence (!) here are my results:

Actually, I had to do a lot of tweaking to get the emissions that low. The secret isn't so much in how the power is generated - the Liberal Democrats only managed to reduce their emissions by 50% even with 100% renewable energy - but in consumer consumption.

We will need to consume far far less from overseas, and far less from the UK. Is this realistic? Only time will tell.