The name Sana Frini and Philippe Rahm chose for the exhibition responds to an official statement made in 2023 by former French Minister of Ecological Transition, Christophe Béchu. The then Minister stated that as a result of the advance of climate change, France will experience a temperature increase of +4°C by 2100.
Specifically, with regard to the city of Paris, the Météo-France report has announced the following changes for the year 2100:
In summer:
- An increase in the average temperature of up to +5.3°C.
- A drastic increase in the number of heat wave days, which will rise from the current 1 day to between 3 and 26 days per year.
- An increase in the frequency and severity of droughts.
In winter:
- An increase in the average temperature of up to +3.9°C, with fewer periods of frost.
- An increase in the amount of precipitation, without a significant increase in the number of rainy days.

Bap! Biennale d'architecture et de paysage. Curators Sana Frini and Philippe Rahm.
Under these guidelines, the co-curators have invited more than a dozen universities to research architectural solutions used to survive in hot regions, used before the advent of air conditioning. Additionally, several architectural firms currently practicing in more southern latitudes were invited to offer construction alternatives that could be applied in more northern areas.
The ultimate purpose of the exhibition is to highlight the significant challenges and opportunities for architectural and urban design that will be entailed by a transition by cities to a subtropical climate. In response to this issue, a call for projects was held, in which 15 architects were awarded prizes. The various proposals presented their vision of Paris in the year 2100, envisioning a city that will experience temperatures exceeding 50°C, suffer heat waves lasting several weeks in the summer, and endure intense rainfall in other seasons.

Bap! Biennale d'architecture et de paysage. Curators Sana Frini and Philippe Rahm.
Two books have been published to accompany the exhibition: "Four Degrees Celsius Between You and Me," the bilingual French and English exhibition catalog published by ACTAR in Barcelona, which also invites a dozen architectural critics to reflect on the aesthetic and social transformations of cities with global warming; as well as a literary book, "Four Degrees Celsius Between You and Me," published in French in paperback by Éditions POINTS, in which ten French-speaking writers place climate at the center of their fiction.