The authors of a new paper placed ice from subsections of Greenland ice cores in glass flasks. Under a vacuum, the ice melted, releasing the air trapped within the ice. The scientists used the trapped air to calculate the island&#039;s temperatures for the past 2,100 years and compare them to vacillations in solar activity. &lt;br /&gt;  &lt;em&gt;Credit: Takuro Kobashi&lt;/em&gt;