EurActiv: The rush to exploit Canada’s heavy tar-sand oil, which necessitates more energy to recover than conventional oils, could significantly increase global risks of dangerous climate change, warns a new report by the WWF and the Co-Operative Financial Services (CFS), a UK financial group. The exploitation of unconventional oil reserves in Canada and North America could increase global atmospheric CO2 levels by up to 15%, says the report, ‘Unconventional Oil: Scraping the bottom of the …