How a blackened industrial wasteland became a global model for environmental recovery

Countries & Cities · Published 3 October 2026 Swipe more like this →

In short: Once a moon-like landscape of charred rock and acid-stained soil, Greater Sudbury transformed its identity. After decades of intensive nickel mining left the region devastated, the city launched an ambitious regreening program. Today, it stands as a testament to ecological restoration, having planted millions of trees across its rugged terrain.

Greater Sudbury, located in Northern Ontario, was built upon a massive geological formation known as the Sudbury Basin. Formed nearly two billion years ago by a massive impact—likely a comet or meteorite—the basin contains rich deposits of nickel, copper, and other valuable metals. These resources defined the city's trajectory for much of the 20th century, as mining companies like Inco and Falconbridge became global leaders in nickel production. However, the early smelting processes, which relied on open coke beds, combined with heavy logging, stripped the land of its native vegetation and left the granite bedrock permanently stained charcoal black.

The environmental damage was so severe that the area gained a reputation as a wasteland. Acid rain, caused by sulphur emissions from smelters, devastated the local ecology, penetrating up to 3 inches into the rock. The landscape became so barren that NASA astronauts famously trained in the region during the Apollo program to study impact breccia and shatter cones. While a popular myth suggests they visited because the area resembled the Moon, the reality was a focus on unique geological formations created by the ancient impact.

Recovery began in the late 1970s, spurred by the construction of the Inco Superstack, which dispersed pollutants over a wider area and reduced local acidity. This allowed for a massive, multi-stakeholder 'regreening' effort involving the municipality, Laurentian University, and mining companies. By 2010, 9.2 million trees had been planted, and thousands of hectares of land were successfully rehabilitated. In 1992, the United Nations recognized these efforts at the Earth Summit, honoring Sudbury with a Local Government Honours Award for its community-based environmental reclamation. Despite this success, the city continues to balance its industrial roots with ongoing efforts to restore the remaining 30,000 hectares of impacted land.

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