一、天津可持续性发展面临的挑战 改革开放的20年间,天津发生了历史性的巨大变化,国民经济持续快速发展。但是,跨世纪的发展又面临着来自人口、资源、环境方面诸多问题的严峻挑战,这已成为制约天津国民经济发展的重要因素。 1.人口的增长给社会带来很大压力 I. Challenges Facing Tianjin’s Sustainable Development During the 20 years of reform and opening up, historic and tremendous changes took place in Tianjin, and the national economy continued its rapid development. However, the cross-century development faces harsh challenges from many issues concerning population, resources and the environment. This has become an important factor that restricts the development of Tianjin’s national economy. 1. Population growth has put a lot of pressure on the community