Montreal Gazette: A coalition of North American environmental groups plans to welcome Prime Minister Stephen Harper to Washington this week with an advertising blitz targeting Alberta’s oilsands and Ottawa’s climate change policy. “Our top line message is that Canada’s tarsands are inconsistent with President Obama’s clean energy vision,” says Gillian McEachern, senior climate campaigner at ForestEthics. Dimitri Soudas, a spokesman for Harper, said the prime minister plans to use his meeting …