A report places Repsol among the 50 largest global emitters of CO₂ in the last 170 years. 122 companies and entities are responsible for 72% of all the carbon dioxide emitted by the fossil and cement sector since the beginning of the Industrial Revolution.

Report prepared by the British research center InfluenceMap has tracked the contribution to climate change of the world's large fossil fuel producers and cement companies. The study classifies entities into three categories: investor-owned companies, state-owned firms and nation states.