Lynch, like his boss the Prime Minister and many Alberta cabinet members, have been keen to counter some of the messaging from environmental groups that oil sands development is 'dirty'.... Here's the piece I and my colleague Mike De Souza filed on this issue this afternoon: OTTAWA - Environmental activists are warning U.S. lawmakers and consumers that Canada's oilsands are an environmental disaster, the latest salvo in a pitched public relations battle over Western Canada's resource riches.... So, environmental groups who are trying to limit or clean up oilsands developments are taking their message to the United States in the hopes that U.S. federal and state policy-makers will prevent imports of what they call "dirty oil" from Canada.