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"China and African countries have accumulated rich experience in self-development and poverty reduction. China is willing to strengthen exchanges with African countries to benefit both parties," he said.

"China is a superpower with great opportunities, not only compared with my country, but also other countries in the world," said Muhammad Salman, 28, of Pakistan, who is studying for a PhD in bioengineering at Beijing University of Technology.

"China needs at least 2 trillion yuan (0.4 billion) of green investment annually over the next five years to promote environmental protection and reduce pollution," PBOC chief economist Ma Jun said in March.

"China has gradually played a more significant role leading global efforts to fight ... climate change," she said, adding that the UN expects China is able to continue playing a role in pushing the Paris pact forward.

"But with the social and economic development, water shortages, damage to aquatic ecosystems and water contamination have become the main issues," he added.