BNP Paribas is to stop doing business with companies whose primary activity involves oil and gas extracted from shale deposits or tar sands in one of the most aggressive steps so far by an international bank to reduce exposure to fossil fuels. The French lender said it would no longer finance new shale or tar sands projects nor work with companies mainly focused on those resources. It also ruled out involvement in oil and gas exploration and production in the Arctic... The move expands an earlier commitment by the bank to stop financing coal mining and coal-fired power projects and highlights the growing risks facing the oil and gas industry from global efforts to tackle climate change.