The study "Forest are chill: The interplay between thermal comfort and mental wellbeing" by Loïc Gillerot, Kevin Rozario, Pieter De Frenne, Rachel Oh, Quentin Ponette, and others, investigates the cooling effects of forests on thermal comfort and mental well-being. The research was conducted in peri-urban forests in Austria, Belgium, and Germany, with 223 participants. Key findings include: 1. **Objective Thermal Comfort**: Forests reduced daytime modified Physiologically Equivalent Temperature (mPET) by an average of 9.2 °C, with high-diversity forests being the coolest. Forests also lowered thermal sensation votes, with only 1% of participants feeling 'warm' or 'hot', compared to 34% under baseline conditions. 2. **Subjective Thermal Comfort**: Participants never felt hot in forests and two-thirds felt very comfortable. Despite the desire for a temperature increase among 47% of participants under cool forest conditions, approximately two-thirds still reported feeling very comfortable, in contrast to only one-third under baseline conditions. Even at a constant perceived temperature, participants were 2.7 times more likely to feel warmer under baseline conditions compared to forests. 3. **Mental Wellbeing**: Forests led to higher positive affect, reduced negative affect, reduced state anxiety, and perceived stress compared to urban controls. The interaction between thermal and mental wellbeing was significant, with forests enhancing mental well-being. The study highlights the importance of forests in mitigating heat stress and improving mental health, suggesting that the psychological benefits of forest environments may play a crucial role in enhancing thermal comfort.The study "Forest are chill: The interplay between thermal comfort and mental wellbeing" by Loïc Gillerot, Kevin Rozario, Pieter De Frenne, Rachel Oh, Quentin Ponette, and others, investigates the cooling effects of forests on thermal comfort and mental well-being. The research was conducted in peri-urban forests in Austria, Belgium, and Germany, with 223 participants. Key findings include: 1. **Objective Thermal Comfort**: Forests reduced daytime modified Physiologically Equivalent Temperature (mPET) by an average of 9.2 °C, with high-diversity forests being the coolest. Forests also lowered thermal sensation votes, with only 1% of participants feeling 'warm' or 'hot', compared to 34% under baseline conditions. 2. **Subjective Thermal Comfort**: Participants never felt hot in forests and two-thirds felt very comfortable. Despite the desire for a temperature increase among 47% of participants under cool forest conditions, approximately two-thirds still reported feeling very comfortable, in contrast to only one-third under baseline conditions. Even at a constant perceived temperature, participants were 2.7 times more likely to feel warmer under baseline conditions compared to forests. 3. **Mental Wellbeing**: Forests led to higher positive affect, reduced negative affect, reduced state anxiety, and perceived stress compared to urban controls. The interaction between thermal and mental wellbeing was significant, with forests enhancing mental well-being. The study highlights the importance of forests in mitigating heat stress and improving mental health, suggesting that the psychological benefits of forest environments may play a crucial role in enhancing thermal comfort.