Inter Press Service: As Canada’s tar sands extraction expands full steam ahead, a perfect storm of internal and external opposition could derail some of the voracious growth at the world’s largest energy project. Together, skyrocketing construction costs, falling crude prices, increasingly vocal opposition from some native groups, and a little known section of the 2007 U.S. Energy Independence and Security Act all threaten growth projections in northern Alberta. “If I was an investor, I wouldn’t …