After the Second World War, the US government began to stockpile nickel, to diversify its supply of non-communist nickel. Falconbridge was the chief beneficiary of this policy and grew significantly. Between 1946 and 1961, the region's population grew from 70,000 to 137,000.
In the 1950s and 60s, global competition as well as labour unrest had a significant impact on the Sudbury mines. As well, environmental concerns were raised about the sulfur dioxide emissions from the smelting process, which so damaged the local landscape that NASA astronauts rehearsed their lunar landings in the area. These concerns led to the construction of the Superstack in 1972, which dispersed the smelter's emissions into the jet stream. Over the past 20 years, the city has replanted millions of trees, and the region has regained much of its original greenness.
The city and the surrounding area is now popular to visitors wishing to experience Ontario's rugged northern wilderness, while enjoying the benefits of a mid-sized city
More history of Sudbury