CO2 from cars used as ink on public health billboard
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Peru is swiftly on its way to becoming South America’s most polluted country, says the World Health Organization’s Global Urban Air Pollution Database. In recognition of the need for cleaner air, Calidda, a leading natural gas provider, worked with the McCann advertising agency to run a public health campaign called Lima Talks. The campaign transformed the carbon dioxide from passing cars into a billboard advert with a message for the citizens of the city.
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