By Mike Lucibella April 21, 2021 Antarctica’s massive Thwaites Glacier is melting because of climate change, and a collapse of the glacier could raise sea levels significantly around the world. To glaciologists, it’s “the glacier of greatest concern” and the focus of the largest-ever joint U.S.-U.K. Antarctic field research program - the International Thwaites Glacier Collaboration. The U.S. National Science Foundation and the U.K. Natural Environment Research Council have teamed up to send scientists to the remote region by land, sea and air to study every aspect of the glacier and better predict how it will impact the world’s coastlines in the coming decades and centuries.