Reuters: Environmentalists are taking aim at Alberta’s C$5.6 billion ($5.4 billion) tourism industry in the latest battle over the impact of developing the Canadian province’s oil sands. Alberta is the largest supplier of crude oil to the United States and the environmentalists say their “Rethink Alberta” campaign is in response to pro oil-sands lobbying and advertising in the United States by the Alberta government and the province’s oil industry. The campaign, led by San …