Warming halted a new ice age, researchers report

Researchers say human-driven warming reversed the start of a new ice age. A study published in the journal Science examined the Barnes ice cap on Baffin Island in northern Canada, the last remnant of the Laurentide ice sheet. According to the study authors, the ice cap began expanding around 2,000 years ago, signaling the onset of a new ice age. By the 1960s, warm summers had caused it to shrink again. Lead author Nicolás Young is a geochemist at Columbia University.