Smoke covers much of Siberia, as shown by the NASA Worldview image dated July 25, 2019.
When soot from fires settles on snow and ice, it darkens the surface, resulting in more sunlight getting absorbed (instead of reflected back into space, as was previously the case), thus further speeding up the melting.
The loss of sea ice north of Greenland is particularly worrying, since this is the area where once the thickest sea ice was present. The image below shows the situation on July 24, 2019.
The huge recent fall in sea ice thickness is illustrated by the graph below, by Wipneus.
The situation is dire and calls for comprehensive and effective action, as
Original Title: Smoke Covers Much Of Siberia
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