Russian scientist Sergei Simov shows how Siberia's permafrost is melting. The permafrost is key to the world's climate. It contains twice as much carbon as is found in the Earth's atmosphere. If it thaws, climate-damaging gases will be released.
Raging wildfires have swallowed up an area across Siberia bigger than Belgium, with smoke enveloping cities. Observers and activists slammed the Russian government for not responding earlier.
The UN's meteorological agency has said CO2 levels are accelerating at the highest rate on record and showing "no sign of a slowdown." The report comes one week ahead of a UN climate summit in Madrid.
Russia's military will join the combat against wildfires raging in Siberia as they rip through several remote regions, Kremlin officials said. The fires are affecting Arctic snow, a climate expert told DW.
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