Canadian oil-sands producers like Suncor Energy Inc. like to tout the long life of the world’s third-largest crude reserves as their greatest asset. That longevity may now be their biggest liability with a new global agreement to curtail carbon emissions. Alberta is one of the costliest — and most carbon intensive — places in the world to produce oil. With prices below $40 a barrel, oil-sands growth has already ground to a halt. Hopes of a return to the boom years are fading amid limits on emissions and the uncertainty of future fossil fuel demand. “There’s a risk of stranded barrels in the oil sands,” said Laura Lau, a portfolio manager at Brompton Funds who oversees about C$1 billion ($729 million) in assets including Suncor. “Part of this would have happened because of the economics, but with these carbon constraints, it gets worse.” Governments from 195 countries committed over […]