Steven Guilbeault quit cabinet last week after Prime Minister Mark Carney signed a deal with Alberta over a potential pipeline project to the B.C. coast. Laura Lynch, host of What On Earth, asked the former environment minister why this was his last straw. Listen to the full What On Earth interview here: https://www.cbc.ca/listen/live-radio/1-429-what-on-earth/clip/16186059-the-last-straw-tequila-shot-ex-climate-minister »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For