Stop Esso's consumer boycott has focused on the greenhouse gas production and climate change policies of Esso. Esso's critics claim the company produces twice the CO2 pollution of a country such as Norway . Company data revealed a 2% increase in greenhouse gas production in 2004 to 135.6m tonnes. Supporters of Stop Esso argue that BP has a similar level of production as Esso with nearly 50% less greenhouse gas emissions. One environmental consultancy believed Esso underestimated its greenhouse gas production because it excluded petrol stations and tankers. It estimates Exxon's production at over 300m tonnes.
