Associated Press: A Greenpeace protest shut down Royal Dutch Shell PLC’s massive oil sands mine on Tuesday on the eve of Prime Minister Stephen Harper’s visit with President Barack Obama. Two dozen Greenpeace members chained themselves to giant earth-moving equipment, shutting down Shell’s massive Albian Sands oil sands mine in northwestern Alberta for several hours. Alberta’s oil sands projects have been criticized as a growing source of greenhouse gas emissions. Shell temporarily suspended …