Satellite Data Reveal Over 12 Trillion Tons of Ice Vanished from Greenland and Antarctica Since 1979

Satellite observations spanning nearly five decades show that the combined ice sheets of Greenland and Antarctica have lost more than 12 trillion tons of ice since 1979, according to a comprehensive new scientific assessment. The melt volume, equivalent to about 11.3 trillion metric tons, is enough to lay a five‑foot‑deep sheet of ice over the entire continental United States.

The findings, derived from long‑term measurements by missions such as NASA's GRACE (Gravity Recovery and Climate Experiment) and its successor GRACE‑FO, as well as laser altimetry data from ICESat‑2, document an accelerating trend in ice loss. Researchers note that while the early years of the record showed relatively modest declines, the rate of disappearance has surged in the past two decades, mirroring broader patterns of global warming.

Greenland’s contribution dominates the total loss, with its peripheral glaciers and the interior ice sheet shedding the bulk of the mass. Antarctica, though historically more stable, has begun to exhibit notable deficits, especially in the West Antarctic Ice Sheet and the rapidly changing Peninsula region. The combined melt adds directly to global sea levels, intensifying concerns about coastal flooding and the long‑term habitability of low‑lying regions.

Scientists stress that the magnitude of the melt underscores the sensitivity of the polar ice reservoirs to rising atmospheric temperatures. The loss of 12 trillion tons of ice translates into a measurable rise in sea level, compounding the effects of thermal expansion of seawater. While the exact contribution to sea‑level rise varies across studies, the consensus is that the polar melt now accounts for a significant share of the observed increase over the past half‑century.

The report’s authors caution that the current trajectory is unsustainable. If warming trends continue, the rate of ice loss could accelerate further, potentially triggering feedback mechanisms such as increased iceberg calving and altered ocean circulation. Such changes would have cascading impacts on global climate patterns, marine ecosystems, and human communities dependent on stable coastlines.

Policymakers and climate strategists are urged to consider the new data when shaping mitigation and adaptation plans. The stark visual of a five‑foot ice sheet covering the United States serves as a tangible illustration of the scale of change occurring at the planet’s poles, reinforcing the urgency of emissions reductions and investment in resilient infrastructure.

Looking ahead, scientists plan to refine their measurements with upcoming satellite missions and improved modeling techniques. Continued monitoring will be essential to track how ice dynamics respond to both natural variability and anthropogenic influences, offering clearer guidance for international climate negotiations and long‑term planning.