It could take only a few decades for the ice melt in Antarctica to outweigh the ice gains, the paper’s authors say.

“I don’t think there will be enough snowfall increase to offset these losses,” Jay Zwally, NASA glaciologist and lead author of the study, said in a press release.

For now, the study authors say, these findings challenge current explanations for sea level rise, much of which is attributed to melting ice sheets in Greenland and Antarctica.

“The good news is that Antarctica is not currently contributing to sea level rise, but is taking 0.23 millimeters per year away,” said Dr. Zwally.