Source: https://www.reuters.com/article/us-eu-canada-trade/exclusive-canada-warns-eu-of-trade-conflict-over-oil-sands-idUSTRE7331JH20110404?feedType=RSS&feedName=GCA-GreenBusiness&WT.tsrc=Social%20Media&WT.z_smid=twtr-ReutersGreenBiz&WT.z_smid_dest=Twitter