- States the severe 2010 heat wave in western Russia was found to be influenced by anthropogenic climate change
- States that soil moisture-temperature feedbacks were deemed important for the buildup of the exceptionally high temperatures
- Quantifies the relative role of both factors by applying the probabilistic event attribution framework
- Analyzes ensemble simulations to distinguish the effect of climate change and the 2010 soil moisture conditions for annual maximum temperatures
- Finds the dry 2010 soil moisture alone has increased the risk of a severe heat wave in western Russia sixfold, while climate change from 1960 to 2000 has approximately tripled it
- Finds the combined effect of climate change and 2010 soil moisture yields a 13 times higher heat wave risk
- Concludes that internal climate variability causing the dry 2010 soil moisture conditions formed a necessary basis for the extreme heat wave
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