This is a very well-written piece for the lay public.
"In studying one of the most dramatic episodes of global change since the dinosaurs, the researchers show that we are currently in uncharted territory in the rate carbon is being released into the atmosphere and oceans," said Candace Major, program director in the National Science Foundation (NSF) Division of Ocean Sciences, which funded the research.
The findings suggest that humans [now] are responsible for releasing carbon about 10 times faster than during any time in the past 66 million years.