USA TODAYATF warns of danger from 'hash oil' explosionsUSA TODAYDENVER — A potentially explosive technique used to make a powerful marijuana concentrate from pot leaves and stems has federal investigators cautioning the public about the risks of ha …

CBC.caBig Oil to Rachel Notley: Bring on a carbon taxCBC.caTo hear an oil industry chieftain advocate for a carbon tax, as Suncor's Steve Williams did in front of a downtown Calgary crowd on Friday, may feel incongruous, but consider who those comments …