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Pacific Ocean
"The long-term warming trend driven by human activities continued unabated," researchers said.
The Revillagigedo Archipelago National Park spans more than 57,000 square miles roughly the size of Georgia.
WHAT'S HAPPENING
NOAA has described the phenomenon as a "river in the sky."
It's a "death sentence for the walrus," a conservation group said.
The consequences could be devastating, experts warn.
Kim Jong Un said the test was necessary to undertake more exercises with the Pacific as the target.