Heat Exchangers

[bigpaul]

I think 90% is the starting figure.
but you are right SD, most people dont have a clue how to look after themselves when all the systems have collapsed.
about 80% now live in Britain's cities, it may be slightly more than that now, I did the figures and it works out to 80%+.
I dont know about people leaving the cities, especially younger ones who have never seen an open fire or seen a plant in its natural state, dont forget we have an obesity crisis in this country and most of that is the younger generation living off take aways and chemically filled ready meals.