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Keeping Cool with Colors—Vienna Museum Paints Asphalt to Fight Heat

The project uses colorful art to lower asphalt temperature by 11°C and visualize CO2 emissions, combining creativity and science to address climate change impacts, officials said.

  • A project led by a Vienna museum painted bright colors on a black asphalt courtyard, lowering ground temperature from 31C to 20C.
  • The initiative responds to more intense and frequent heatwaves caused by climate change, prompting European cities to adapt their urban planning.
  • Austrian artist Jonas Griessler and his collective created artwork representing yearly CO2 emissions between 1960 and 2000, using dots where each equals a billion tons.
  • Environmental health expert Hans-Peter Hutter said the temperature drop reduces building cooling needs, thus lowering air conditioning usage, calling it part of adapting to urban heatwaves.
  • Project leaders urge improved climate communication so people do not lose hope and see adaptation as engaging, while artist Griessler critiques society's light and inconsistent approach.
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Keeping cool with colours -- Vienna museum paints asphalt to fight heat

Equipped with an infrared thermometer, Austrian artist Jonas Griessler measures the sweltering heat in an inner courtyard in the centre of Vienna.

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Barron's broke the news in New York, United States on Friday, August 15, 2025.
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