quote [ mortality risk rises rapidly as daily maximum temperatures increase (Fig. 1c). Days above 40 ◦C cause a >6% increase in weekly mortality rates compared with days around 25 ◦C. In most cases, warmer regions in Europe appear less vulnerable to heat, consistent with evidence of adaptation – but this pattern reverses for days above 40 ◦C, with warmer regions experiencing greater mortality risk, potentially indicating fundamental limits to adaptation (Fig. 1a). ]