The natural cooling effect of snow in northern forests following forest fires is rapidly diminishing. As a result, a fragile climate equilibrium threatens to disappear, potentially leading to additional warming in one of the most climate-sensitive regions on Earth. This is the conclusion of new research by Vrije Universiteit Amsterdam. …After a forest fire, the landscape in northern regions often remains open and covered with snow for a long time. This snow reflects a great deal of sunlight and makes the Earth’s surface brighter—an effect known as snow albedo. For years, this compensated for part of the warming caused by CO2 emissions from forest fires. [The study found] that the cooling effect of snow has decreased by nearly 30 percent since the 1960s. Whereas in the past almost half of Canadian forest fires eventually reached natural climate equilibrium …this now applies to only about one in four or five fires.