In addition, Hong Kong also vigorously promotes renewable energy, including introducing feed-in tariffs, encouraging private organizations and the public to invest in distributed renewable energy, selling renewable energy certificates for electricity from renewable energy, and assisting distributed renewable energy access power grid etc. In the field of construction, continuously improve the energy efficiency of buildings, promulgate and implement the &quot;Regulations on Energy Efficiency of Buildings&quot;, set clear energy-saving targets for government buildings and conduct energy audits for major government buildings; improve the energy efficiency of electrical appliances, and implement the &quot;Mandatory Energy Efficiency Regulations&quot;. &quot;Labeling Scheme&quot;; carry out building greenhouse gas emission accounting, and release building carbon audit guidelines. In the field of transportation, the railway network continues to expand. When the newly planned railway project in the &quot;Railway Development Strategy 2014&quot; is completed, the total length of Hong Kong&#39;s railways will increase to more than 300 kilometers, covering areas where 75% of the population lives in Hong Kong. The proportion of passenger capacity will rise to 45%-50%; vigorously promote the use of electric vehicles, and introduce policies and measures including exemption of the first registration tax for electric vehicles. In the field of waste disposal, waste reduction is advocated, waste reduction is encouraged, recycling and recycling are promoted; resource recycling is strengthened, and all operating landfills use landfill gas as fuel for energy production. The use of landfill infrastructure also provides thermal energy for leachate treatment facilities; increase waste resource utilization, and strengthen planning research on future waste management and transfer facilities. Promote comprehensive and sustainable urban landscape design and tree management initiatives in the area of tree planting and urban greening. See Table 5-4 for specific mitigation measures and their effects in various fields.