Business Green: The rapid emergence of green construction techniques and low carbon building technologies was underlined last week after supermarket giant Tesco opened a major new store that it claims has a carbon footprint 70 per cent lower than an equivalent sized store built just over two years ago. The company said its new 52,000sq ft Cheetham Hill store in Manchester would provide a “low carbon blueprint” for all future stores built in the UK. According to Tesco, a raft of energy …