* EU trade and climate chiefs to tackle Canadian tar sands
* EU sets aside worries that Canada will scrap trade deal
* Documents show EU believes it would win any WTO challenge
By Pete Harrison and Juliane von Reppert-Bismarck BRUSSELS, Feb 23 (Reuters) - Europe's trade and climate chiefs are preparing to take a stand against imports of oil from Canada's polluting tar sands, despite fears the move might wreck a multi-billion dollar trade deal, according to EU sources and documents.
European Union sources said this week that Canada had threatened to pull out of trade talks because of the clash, but Ottawa has denied that.
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