TL;DR: * This heatwave is the hottest in more than 120 years' worth of historical data; * Wet-bulb temperatures are close to heatstroke levels; and * Tempera

TL;DR: * This heatwave is the hottest in more than 120 years' worth of historical data; * Wet-bulb temperatures are close to heatstroke levels; and * Temperatures have been getting worse in recent years.