Satellite Measurements Show Over 12 Trillion Tons of Ice Lost from Greenland and Antarctica Since 1979

Nearly five decades of satellite monitoring reveal that the ice sheets of Greenland and Antarctica together have shed in excess of 12 trillion tons of ice since 1979, according to a thorough new scientific assessment. This melt volume, roughly equivalent to 11.3 trillion metric tons, could form a five‑foot‑deep ice layer covering the entire continental United States.

The conclusions draw on long‑term records from missions such as NASA’s GRACE (Gravity Recovery and Climate Experiment) and its follow‑on GRACE‑FO, together with laser altimetry from ICESat‑2. Researchers point out that the early portion of the dataset showed only modest losses, but the pace of disappearance has sharply increased over the last twenty years, echoing wider trends of global warming.

Greenland accounts for the lion's share of the total loss, with both its peripheral glaciers and the interior ice sheet contributing the bulk of the mass deficit. Antarctica, traditionally more stable, is now showing appreciable shortfalls, particularly in the West Antarctic Ice Sheet and the rapidly evolving Peninsula region. This combined melt directly augments global sea levels, heightening worries about coastal flooding and the long‑term livability of low‑lying areas.

Scientists emphasize that the scale of the melt highlights how responsive polar ice stores are to rising atmospheric temperatures. The disappearance of 12 trillion tons of ice translates into a detectable rise in sea level, adding to the effect of seawater thermal expansion. Although estimates of the exact sea‑level contribution differ among studies, the prevailing view is that polar melt now represents a substantial portion of the rise observed over the past fifty years.

The authors of the report warn that the present trend cannot be sustained. Continued warming could push ice loss rates even higher, potentially triggering feedback loops such as more frequent iceberg calving and shifts in ocean circulation. These changes would ripple through global climate systems, marine ecosystems, and human communities that rely on stable coastlines.

Policy makers and climate planners are urged to incorporate these new findings into mitigation and adaptation strategies. The striking image of a five‑foot‑thick ice sheet draped over the United States provides a concrete illustration of the magnitude of change occurring at the poles, reinforcing the need for emissions cuts and investment in resilient infrastructure.

Looking forward, researchers intend to sharpen their measurements with forthcoming satellite missions and enhanced modeling approaches. Ongoing observation will be crucial for tracking how ice dynamics respond to both natural variability and human‑driven influences, offering clearer direction for international climate talks and long‑term planning.