"There's been a significant shift in the ecosystem because of the rises in winter temperatures," he said. "On average, Alaska's temperature has risen 6.4 degrees in winter and 3.4 degrees overall. And, the earlier the snow melts, the earlier the pollen cycle begins."
Demain said it's estimated that 90 percent of the Alaskan tundra will be forested by 2100, and that the types of trees that are most common are changing, too.
The warmer temperatures are also attracting insects. In the past, Alaska hasn't had too many stinging insects. But now, northern Alaska has recently seen a 620 percent increase in the number of people seeking care for bee stings, Demain said.
"The climate is changing, and it's changing at an unprecedented rate. Whether it's a natural cycle, or whether humans are the cause, we have to recognize that this is happening," said Demain.
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Editor:Yang Jie
