A new research from UK-based website SaveOnEnergy warns visits to popular fashion retailers’ websites could potentially contribute to CO2 generation. The research surveyed 20 most populated UK cities across the UK and at 25 retailers, including Next, Asos, Zara, and Shein. It names Next as the largest contributor to CO2, in the UK with 5,100,000 average monthly searches.

Online retailer Boohoo was the second-biggest producer, with potentially 10,815kg of CO2 emitted per month – equivalent to driving 26,836 miles. PrettyLittleThing was found to be the potentially lowest monthly contributor, producing only 142kg of CO2 per month. One visit to PrettyLittleThing’s website generates 2.34g of carbon dioxide.

The survey states, London generated the most CO2 from fast-fashion retailers with an average of 9,005kg of CO2 produced from website visits per month. For Asos alone, London had an average of 673,000 searches. Birmingham came second after London and Liverpool third. In ninth place was Edinburgh, potentially producing 601kg per month from searches, and tenth place was Belfast, producing around 597kg of carbon dioxide per month.