The job of a politician is to find the compromise solution between extreme positions. I'm with Trudeau on this one, although critical of many other issues. The oil sands will not, realistically, be shut down. The economy of the Western half of Canada depends on them. Pipelines are the least risky way of transporting the product. A way to market must be found. OTOH, once the sands are depleted, the area must be re-forested, which is what is happening even today in older parts of the oil-sands, and will once again become a habitat for many species of animals. 

There are enough pipelines in the USA to encircle the world many times over. Obama would never have blocked the Transcanadian project if it had been an American company. The State of Wisconsin has a bigger carbon footprint than the whole of Canada. There are 13 oil fields surrounding Los Angeles. This ageing actress should burn the carbon fuel from her private jet to fly somewhere in her own country and exhaust her vitriol there.