Catherine Ndereba. Photo: Kirby Lee/WireImage

Photo: Kirby Lee/WireImage

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Catherine Ndereba, Kenya, Marathon

Clean-air advocate and reigning women’s marathon world champion, Catherine Ndereba became part of the UNEP “Champion for the Environment” campaign to raise awareness of air pollution. The Nairobi resident believes that “more people need to use their legs rather than cars, whenever possible, to reduce air pollution.”