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Nike also caused controversy during the 2008 Olympics in Beijing, China, when its sponsored Chinese athlete, Liu Xiang, withdrew from the Olympic 110 metre hurdles, leaving the track after a false start by another competitor. Liu claimed that he withdrew due an ankle injury.[33] However, an anonymous message was posted on the internet, purportedly from a source close to Nike, claiming that the corporation had forced Liu to withdraw as he was unlikely to win, thereby tarnishing their image. Nike responded by announcing that "we have immediately asked relevant [Chinese] government departments to investigate those that started the rumour".[34]According to the New England-based environmental organization Clean Air-Cool Planet, Nike ranks among the top three companies (out of 56) in a survey of climate-friendly companies.[35] Nike has also been praised for its Nike Grind program (which closes the product lifecycle) by groups like Climate Counts.[36] One campaign that Nike began for Earth Day 2008 was a commercial that featured basketball star Steve Nash wearing Nike's Trash Talk Shoe, which had been constructed in February 2008 from pieces of leather and synthetic leather waste from factory floors. The Trash Talk Shoe also featured a sole composed of ground-up rubber from a shoecheap nike outlet recycling program. Nike claims this is the first performance basketball shoe that has been created from manufacturing waste, but it only produced 5,000 pairs for sale.[37] Another project Nike has begun is called Nike's Reuse-A-Shoe program. This program, started in 1993, is Nike's longest-running program that benefits both the environment and the community by collecting old athletic shoes of any type in order to process and recycle them. The material that is produced is then used to help create sports surfaces such as basketball courts, running tracks, and playgrounds.[38] A project through the University of North Carolina at Chapel Hill found workers were exposed to toxic isocyanates and other chemicals in footwear factories in Thailand. In addition to inhalation, dermal exposure was the biggest problem found. This could result in allergic reactions including asthmatic reactions.