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In the current context of climate change, the increase in minimum temperatures recorded in recent decades has received special scientific attention due to its importance for the proper night's sleep and health of the population, among other considerations. One of the main indicators usually considered refers to the frequency of tropical nights (≥20°C), which have begun to become widespread in regions hitherto excluded from this type of event. This paper analyses tropical nights in Spain between 1970 and 2023, addressing their mean annual occurrence, their intensity, their monthly distribution and the average number of consecutive tropical nights recorded, as well as their relationship with relative humidity. The results, based on the analysis of 75 homogenized series located in 44 different provinces, allow us to differentiate seven large areas based on the minimum temperature in which there has been an increase in the frequency and intensity of tropical nights, which progressively extend the season in which they can appear. Similarly, a generalized increase in the maximum number of consecutive nights thermally above 20°C was identified, in addition to the presence of high relative humidity in coastal areas during these episodes. [ABSTRACT FROM AUTHOR]

Climate change enhanced by human beings has become one of the greatest challenges humanity has faced in its entire existence. In this paper, an analysis is made of the variables that influence the environmental perception of the population of thirty countries —28 European countries, USA and China—, in order to estimate the most explanatory factors and identify the causes of the appreciable differences in awareness between States. The study is based on a representative survey conducted between 2021 and 2022 among more than thirty thousand people in the above-mentioned countries. After a first level of aggregate analysis to establish perceptual differences between States, a more detailed study is carried out which, after considering a wide variety of socio-demographic variables, leads to the conclusion that the population’s perception and awareness of the climate issue is markedly ideological. Nevertheless, within what is conventionally understood as awareness, it is possible to differentiate between multiple aspects: awareness of the seriousness, perception of impacts, predisposition to an eventual change in habits, support for government measures, etc. [ABSTRACT FROM AUTHOR]