| 1 | Officials at Wugang, the nearest town, say they did not know the smelter existed. | |
| 2 | Engineers led by Donald Sadoway at the Massachusetts Institute of Technology were inspired by the way aluminium is smelted using electricity. | |
| 3 | Chimneys from a rare earth smelting plant rise into the sky as heavily polluted discharges pour into the water near Baotou in Inner Mongolia. | |
| 4 | It is produced from the burning of fossil fuels (coal and oil) and the smelting of mineral ores that contain sulfur. | |
| 5 | Polluting industries such as leather tanneries and metal smelters are no longer tolerated in many Chinese cities. |
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