The Arctic, the northernmost polar region characterized by cold winters and vast sheets of white ice, is "undergoing rapid, sometimes turbulent change beyond anything previously experienced," according to a new five-year study.

"While some changes, such as warming temperatures, are gradual, others, such as the collapse of ice sheets, have the potential to be not only abrupt, but also irreversible," says the Arctic Resilience Report. "This means the integrity of Arctic ecosystems is increasingly challenged, with major implications for Arctic communities and for the world as a whole."

Rising sea levels are already battering America’s coastlines, and threatening to cause entire islandsto disappear underwater.

External factors, primarily human activity, is blamed in the report: "Much of the increased pace and scope of Arctic change can ultimately be linked to the impacts of human activities," it says.

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A report in Scientific American this month appears to support the observations made by the Arctic Council, suggesting that sea ice growth in the region slowed to a crawl "and even started shrinking" after the sun set on the region.

Mark Serreze, director of the National Snow and Ice Data Center, described the phenomenon to Scientific American as being without a known precedent.

“I’ve never seen anything like it this last year and a half,” he said.

For both America and the world, these additional reports of the Arctic’s decline arrive at an uncertain time for environmental activists.

President-elect Donald Trump has cast doubt on the notion of climate change in the past, and his team has indicated that he could consider eliminating research on the subject by NASA in an effort to crack down on “politicized science.”

U.N. Secretary General Ban Ki-moon has expressed confidence that Trump would change his approach to climate change after entering office.

"Mr. Trump will really hear and understand the seriousness and urgency of addressing climate change," he said.

In a meeting last week with The New York Times, Trump appeared to soften his tone on the subject by acknowledging "connectivity" between human activity and climate change.

"I think there is some connectivity. Some, something," he said in the meeting.

The World Meteorological Organization (WMO), an intergovernmental U.N. agency, has sounded the alarm about climate change this month. It released a study Nov. 8 suggesting that 2011 to 2015 was the hottest five-year period on record.

The WMO also expects 2016 to shatter all single-year temperature records in terms of warmth.

Besides the U.S., Russia and Canada, other nations on the Arctic Council are: Denmark, Finland, Iceland, Norway and Sweden.