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They will displace 3 million tonnes of carbon dioxide from 2022 compared with fossil fuelbased contracts equivalent to annual emissions from 700000 combustionengine cars They will displace 3 million tonnes of carbon dioxide from 2022 compared with fossil fuelbased contracts equivalent to annual emissions from 700000 combustionengine cars NegativeLONDON BHP the worlds biggest miner said on Monday it had signed four renewable energy contracts to supply all of its Chilean copper operations beginning in 2021 cutting energy costs by http://www.reuters.com/finance/article/us-bhp-chile-renewables/bhp-switches-to-green-power-for-chilean-copper-starting-2021-idUSKBN1X00192019-10-21