Can chalk replace air conditioning? France is putting the idea to the test

France is experiencing a surge in demand for crushed chalk as a cooling solution. This traditional cleaning powder is applied to windows, reflecting sunlight and reducing indoor heat. Scientists confirm the physics behind this method, noting calcium carbonate's reflective properties. While not a complete replacement for air conditioning, it offers a low-cost alternative. This trend highlights a growing reliance on simple, age-old materials for climate resilience.

Raccontata daeconomictimes.indiatimes.com