Northern Arizona University

A new study spanning 12,000 years shows that human-induced climate change has disrupted a long-term global cooling trend

Environment

Human-induced climate change reversed 6,500-year global cooling trend

What would Earth’s climate naturally be doing if it weren’t for human intervention? Researchers have now analyzed 12,000 years of climate data, and found that human-induced warming interrupted and reversed a long-term natural global cooling period.

Space

Trans-Neptunian objects build case for ninth planet

If you grew up knowing that there were nine planets orbiting our sun and were a bit crushed when Pluto lost its status, there might be new hope for a nine-pack, as researchers are again putting forth the idea that a planet might be lurking somewhere out there on the fringes of our Solar System.

The blue line shows estimates of Arctic temperatures over the last 2,000 years. The green line shows the long-term cooling trend. The red line shows the recent warming based on actual observations. (Courtesy Science, modified by UCAR.)

Science

Arctic warming overtakes 2,000 years of natural cooling

Arctic temperatures in the 1990s reached their warmest level in 2,000 years, new research indicates. The study provides new evidence that the Arctic would be cooling if not for greenhouse gas emissions that are overpowering natural climate patterns.