Support local business." Tesco controls nearly one third of the UK grocery market, with almost £1 in every £3 spent on groceries spent at Tesco, according to TNS. Friends of the Earth claims that Tesco's growing market share is bad for UK business, bad for consumers and bad for the environment. Tesco spent £3.7m on energy-saving schemes in the last year, but according to Friends of the Earth, failed to meet its commitment to cut emissions by 4.2% and consumes nearly twice as much energy as the national average.