As Canada wrangles an epic, decades-long saga of who can fish for lobster, and when, emerging threats are heating up the conflict in Nova Scotia.

A multibillion-dollar expansion helped the canal accommodate king-size cargo ships. It might also be fueling ecological upheaval.

An extreme heat wave off California’s coast seemed like an anomaly 10 years ago. But as the ocean warms, the catastrophe may be a glimpse of the future.