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Temperatures on Greenland haven't been this warm in at least 1,000 years, scientists report
After years of research on the Greenland ice sheet — which CNN visited when the cores were drilled — scientists have reported temperatures there have been the warmest in at least the past 1,000 years.
Related Knowledge Center: Climate science
State of Play
What began as a theory in the 1890s — that industrial emissions of carbon dioxide could increase global temperatures — had progressed to a scientific fact a century later. Scientists across a range of disciplines are studying the impact of the still-growing concentration of carbon dioxide and other so-called “greenhouse gases” in the atmosphere as they call for industrial and governmental policies to slow, then halt, the warming of the planet.