Behind a wire fence lies a vast gaping wound of earth. Before Google’s arrival a few months ago, an estimated quarter of a million trees occupied the 330 hectares (815 acres) of forest near the town of Muhos in rural northern Finland . Now they are all gone.

After the tech company illegally stripped the entire area to build a datacentre – taking even the top soil with it – all that remains is a vast expanse of mud indented with the trail marks of machinery, puddles and mounds of earth, roots and branches. Residents say that brown water flowing off the site is going into a stream that feeds the Oulujoki River.

“It doesn’t end. It goes on and on,” says Mari Annala, an ecologist from the Finnish Association for Nature Conservation (SLL), looking at drone footage of the former forest from the perimeter.

Mari Annala is a Finnish environmental expert, researcher and board member of the Oulu region district of the Finnish Association for Nature Conservation.…