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In page Greenpeace:
"A German technological institute developed an ozone-safe hydrocarbon alternative refrigerant that came to a Greenpeace campaigner's attention around 1992.[5][6] The rights to the technology were donated to Greenpeace, which maintained it as an open source patent. The technology was subsequently used in Germany, then China, elsewhere in Europe, and after some years in Japan and South America, and finally in the US by 2012.[citation needed]
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