Winnipeg Free Press By: Bob Weber, The Canadian Press Posted: Last Modified: 9:39 AM CST Tuesday, Feb. 16, 2021 EDMONTON - One of North America's top experts on pollution from coal mines is warning Albertans about the dangers of expanding the industry in the province's Rocky Mountains. A conveyor belt transports coal at the Westmoreland Coal Co.'s Sheerness Mine near Hanna, Alta., onTuesday, Dec. 13, 2016. One of North America's top experts on coal mine pollution is warning Albertans about the dangers of expanding the industry in the province's Rocky Mountains. THE CANADIAN PRESS/Jeff McIntosh EDMONTON - One of North America's top experts on pollution from coal mines is warning Albertans about the dangers of expanding the industry in the province's Rocky Mountains.