Interim London Energy and Greenhouse Gas Inventory (LEGGI) 2014

The London Energy and Greenhouse Gas Inventory (LEGGI) 2014 shows greenhouse gas emissions and energy consumption for London. This is an interim version of the LEGGI 2014, which will be confirmed when final data on energy use is published by the Department of Business, Energy and Industrial Strategy (BEIS) and Transport for London (TfL), expected in late 2017. The LEGGI shows estimates of energy consumption and carbon dioxide equivalent (CO 2 e) 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. The LEGGI uses sub-regional energy (electricity, gas and other fuels) and CO 2 e data published by DECC/BEIS for homes and workplaces, and data from the London Atmospheric Emissions Inventory (LAEI) for energy and CO 2 e data for transport. DECC/BEIS E mission F actors (EFs) are used to estimate greenhouse gas (GHG) emissions from stationary and mobile sources of energy use in the LEGGI. These EFs are produced annually based on the national greenhouse gas inventory two years prior. E.g. 2016 EFs are calculated using national GHG emissions and energy use inventory data from 2014. So, for this 2014 LEGGI we have applied DECC/BEIS 2016 EFs to 2014 energy use to provide a more accurate estimate of GHG emissions in 2014 that is consistent with UK inventory data for 2014. We have retrospectively applied this method for EF selection to data from 2010 onwards to ensure consistency of approach and allow trends in CO 2 e estimates to be assessed. Interim results show that in 2014, London’s CO 2 e emissions were 37.8 million tonnes. This is a 16 percent reduction on 1990 levels and a 25 percent reduction since the peak of emissions in 2000. This is despite an ever-increasing population – an increase of 26 percent since 1990. London’s per capita emissions were estimated at 4.4 tonnes of CO 2 e in 2014, their lowest since 1990.

《2014年伦敦能源与温室气体清单》（LEGGI）揭示了伦敦的温室气体排放与能源消耗情况。此为LEGGI 2014的临时版本，待商务、能源与工业策略部（BEIS）及伦敦交通局（TfL）公布能源使用最终数据后，预计于2017年底确认。LEGGI呈现了伦敦大都会区域住宅、工作场所及交通领域的能源消耗及二氧化碳当量（CO2e）排放的估算值。该清单由大伦敦管理局每年编制，以衡量市长气候变化缓解与能源战略的实施进展。LEGGI采用DECC/BEIS发布的子区域能源（电力、天然气及其他燃料）及CO2e数据，针对住宅与工作场所，并引用伦敦大气排放清单（LAEI）中的能源及CO2e数据。在LEGGI中，使用DECC/BEIS排放因子（EFs）来估算能源使用的固定和移动源温室气体（GHG）排放。这些EFs基于两年前的国家温室气体清单年度生产。例如，2016年EFs是利用2014年的国家GHG排放与能源使用清单数据进行计算的。因此，对于这一2014年的LEGGI，我们应用了DECC/BEIS 2016年的EFs至2014年的能源使用，以提供与2014年英国清单数据一致的更精确的GHG排放估算。我们追溯性地应用此EF选择方法至2010年以来的数据，以确保方法的一致性，并允许评估CO2e估算趋势。临时结果显示，2014年，伦敦的CO2e排放量为37.8百万吨，较1990年水平下降了16%，自2000年排放峰值以来下降了25%。这一成就即便在人口持续增长——自1990年以来增长了26%——的背景下也得以实现。2014年，伦敦的人均排放量估算为4.4吨CO2e，为自1990年以来的最低值。