Public Joint Stock Company Mining and Metallurgical Company Norilsk Nickel has developed a methodology and model for calculating the carbon footprint for all products manufactured by the Company. This methodology for calculating the Company's carbon footprint is based on the from-cradle-to-gate principle, which complies with ISO 14040 and ISO 14044 and is certified by Sphera Solutions Gmbh, a leading European environmental and sustainability consultant. Nornickel's actual carbon footprint for 2020 has been audited and certified by EY in 2021. The carbon footprint takes into account future emissions associated with the launch of the Sulphur Programme in the Company's Norilsk division. The carbon footprint of refined nickel produced by the Company, including a reserve for the Sulphur Programme 2.0 in 2020 was 8.1 kg of CO2-equivalent per kilogram of metal; copper - 5.7 kg CO2-eq/kg of metal; refined cobalt - 19.2 kg CO2-eq/kg of metal; palladium - 20.9 kg CO2-eq/g, platinum 21.2 kg CO2-eq/g of metal, rhodium 22.7 kg CO2-eq/g of metal, gold and silver 2.6 kg CO2-eq/g metal. For most metals, the Company's carbon footprint for its product offering is below the industry average, due to a high share of electricity supplied by renewable sources. In 2020, renewable energy sources accounted for 46% of total electricity consumption by the Group and 55% of total electricity consumption in the Norilsk Industrial District. Increasing the share of clean electricity use for industrial production is one of the Company's strategic priorities.