Telegraph: The chain’s new “low carbon” branch will also use geothermal pumps to bring up hot water from underground aquifers and a wood pellet-burning boiler to help heat the store. Asda hopes the changes will attract the “Thatcher generation” of consumers who are willing to reward retailers with good environmental and social credentials. For many years supermarkets have refused to put doors on anything except shelf-height frozen food because the added inconvenience for shoppers led to a …