Ex-Arizona governor’s illegal makeshift border wall is torn down – but at what cost?

As the wall of shipping crates built through a national forest is removed, environmentalists take stock

Truck horns blasted and red dust billowed beneath the blue Arizona sky as surplus army trucks sped up and down a road along the US-Mexico border, hauling shipping containers out of the Coronado national forest.

Piles of dirt and oak trees, bulldozed by construction crews, dotted the grassland of the San Rafael valley, south-east of Tucson, known as a vital wildlife corridor.