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Breaking down the numbers, it was up to 60 percent of the total trade volume in Shanghai.

Brown is in Beijing to attend a Clean Energy Ministerial meeting, the first international meeting of its kind since US President Donald Trump pulled out of the Paris Agreement on climate change last week.

Both sides agreed that China and Germany, as the world's second-and fourth-largest economies, have an enormous need for enhancing mutual beneficial cooperation in the security sector, and shoulder major responsibilities in safeguarding global peace and stability.

Burning straw used to be a tedious burden for Liu Weiquan as he had to torch tons of it after annual harvests in Anhui province, with nothing to show for it financially.