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In page Airport Carbon Accreditation:

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Airport emissions have been reduced by 55,633 tonnes of CO2 in Year 1 of the programme and 55,501 tonnes in Year 2, and 77,782 tonnes in Year 3 as a result. Year 4 of the programme had a CO2 reduction of 110,003 tonnes - enough to power 45,949 households for a year.[citation needed]