Discussion of Energy Consumption and Management in Tianjin
By using a modified emergy-based ecological footprint model, this paper dynamic calculated and analyzed the emergy-based ecological footprint and carrying capacity of energy consumption of Tianjin city from 2000 to 2008, and on the basis of this assessed the dynamic changes of carbon emission structure of energy consumption of Tianjin. The result showed that in past nine years the ecological carrying capacity per capita has slowly increased from 0.109 hm2•person-1 in 2000 to 0.234 hm2•person-1 in 2008 , the ecological footprint per capita of the city has quickly increased from 0.413 hm2•person-1 in 2000 to 0.578 hm2•person-1 in 2008, the ecological deficit per capita has steeply rose from 0.304 hm2•person-1in 2000 to 0.345 hm2•person-1 in 2008, and the ecological footprint per ten thousand GDP has decreased from 0.243 hm2•person-1 in 2000 to 0.107 hm2•person-1 in 2008. Along with the fast development, carbon emissions of energy consumption also grew rapidly from 3.478 t•person-1 in 2000 to 4.985 t•person-1 in 2008, and carbon emission intensity decreased from 2.046 t/104yuan in 2000 to 0.923 t/104yuan in 2008. Thus, the investigation revealed that the fast development over the past nine years, energy consumption was far over the carrying capacity, while carbon emissions increased unceasingly, shows that non-sustainability energy consumption has been threatening the economic and social development of Tianjin. According to the results, the paper proposes Tianjin city to promote sustainable energy consumption patterns by measures including restructuring of energy consumption construct, reducing the energy intensity, changing the mode of economic growth and make full use of renewable resources, etc.