Helping the canned tuna industry cope with climate change tops an already lengthy to-do list for Darian McBain, chief sustainability officer at the Thailand company that owns the Chicken of the Sea and John West brands.

In a business long accused by activists of abusing workers and killing dolphins, McBain's responsibilities at Thai Union Group PLC typically focused on improving labor rights in the supply chain and reducing the abandoned fishing gear on the high seas.

"Climate change hasn't been the No. 1 topic," she said. "Now, the climate emergency has to be a lot stronger part of the dialogue."