Tangshan is a major industrial city specialized in coal mining and related industries such as power generation, steal and motor vehicle production. Over 30 years of exploitation left the surrounding areas of Tangshan in a devastated state, including severe pollution and land degradation. A comprehensive remediation of the coal mining area cleaned up 13. Million m3 of rubbish removed 240,000 m2 of old industrial structures and planted 1.38 million trees and created a 607-hectare recreation park and garden. 65 hectares of stagnant water ponds have been cleared and purified and turned into a lake, safe for swimming and water life.