The project to build a long-delayed and debated bridge linking the Italian mainland with Sicily has cleared a major hurdle.

Italy's government gave final approval on Wednesday to the construction of what will be the world's longest single-span bridge, connecting Sicily to the mainland, despite financial and environmental concerns that have delayed it for decades.

The government says the road and rail link will create jobs and lift the economy of the region, but critics are concerned about the environmental and social impact.