London Energy and Greenhouse Gas Inventory (LEGGI) 2011 showing greenhouse gas emissions and energy consumption for London. The is the final confirmed version of the LEGGI 2011. LEGGI shows estimates of energy consumption and carbon dioxide (CO2) emissions from Homes, Workplaces and Transport within the Greater London area. It is produced by the Greater London Authority on an annual basis to measure progress against the Mayor's Climate Change Mitigation and Energy Strategy. LEGGI uses sub-regional energy (electricity, gas and other fuels) and CO2 data published by DECC for Homes and Workplaces, and data from the London Atmospheric Emissions Inventory (LAEI) for energy and CO2 data for Transport.