Climate change is particularly intense in the Arctic. To assess its consequences and determine what role this region plays in global warming, two teams of scientists from EPFL visited the area. One to better understand the composition of the air in the region, the other to quantify greenhouse gases sequestered in Greenlandic fjords originating from glacial water. In the Arctic - an area where temperatures are rising three to four times faster than anywhere else on Earth. At the same time, the amount of "life" in the Arctic Ocean is increasing, which affects the production of biological aerosols and affects the formation of clouds. (Sandrine Perroud, Ecole Polytechnique Federale de Lausanne, more at phys.org)