An abrupt release of methane, a powerful greenhouse gas, from ice sheets that extended to Earth’s low latitudes some 635 million years ago caused a dramatic shift in climate, scientists funded by the National Science Foundation (NSF) report in this week’s issue of the journal Nature.
The shift triggered events that resulted in global warming and […]

The world’s oldest known living tree, a conifer that first took root at the end of the last Ice Age, has been discovered in Sweden, researchers say.
The visible portion of the 13-foot-tall (4-meter-tall) “Christmas tree” isn’t ancient, but its root system has been growing for 9,550 years, according to a team led by Leif Kullman, […]