Alaska's temperature has risen by four degrees Fahrenheit in the last 50 years, that's compared with two degrees for rest of the planet. The wildfires has moved across the Brooks Range and onto the North Slope. Arctic Circle wildfires have been persistently above 2003-2018 average through July. A roughly estimated total area burned in Alaska this season as of Wednesday 24/07/2019, 2.06 million acres (832k ha).
According to the European Center for Medium-Range Weather Forecast, around 100 megatons of CO2 were emitted between 1 June and 21 July, or nearly as much as the CO2 emissions of Belgium as a whole in 2017.
It is possible that not only forests are burned down but also peat land areas for the first time. That is crucial, because the fires on peat soils can continue for months.