In 1994, the Ningxia Zhongwei sand-fixation forest farm was listed as a "Global 500" site for environmental protection by the United Nations Environment Programme.
Elizabeth Dowdeswell, then the executive director of the UNEP, issued the certificate to Zhang in London.
"I was excited then, because our decades of sand control efforts were recognized by the world," Zhang recalled.
Infographic:
A look at China's economy in Jan-Feb, 2026
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China to expand two-way investment cooperation
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China to open wider to outside world