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Justin Rowlatt's third report from his epic drive through China looks at the country's response to the threat of its growing deserts, planting billions of trees to create a so-called "green wall". In a country where more than a quarter of the land is either desert or suffering desertification, many scientists doubt whether this response will be effective. Li Bo, a former chief of the Friends of Nature, says environmental issues are moving up the agenda in China. And Justin visits the Ordos desert and tries the sport of dune-racing. And from Kenya, our regular commentator Wycliff Muga reflects on how new information can change people's lives - and alter the relationship between governments and government-paid workers.