Scientists say it's "very possible" and "very probable" that three earthquakes this year, measuring to on the Richter scale, were caused by fracking in Fox Creek, Alberta. But locals aren't revolting against the industry.
US government says drilling causes earthquakes – what took them so long?
Vietnam vet Mark Crismon owns land in Oklahoma that contains minerals worth millions - but he has chased away the oilmen that offered him money. Instead he is helping Oklahoma State University with a seismic study tracking the "swarm" of earthquakes since fracking started.