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Deserts cover nearly 40 million square kilometers of Earth, accounting for a quarter of its land surface. More than 110 countries and about 1 billion people around the world have been affected by desertification.

"China adheres to a road of peaceful development and pursues a national defense policy with a defensive nature," spokeswoman Hua Chunying told a regular press conference, adding that China is transparent in its military's strategic intent and poses no threat to any country.

The boy is the son of Shandong's first confirmed H7N9 patient. But initial investigation found no evidence of human-to-human infection, according to a statement from the provincial public health department.

It added that China will primarily push forward the construction of innovative bases and advance the infrastructure used for scientific research and experiment.

Xi and Obama held two rounds of talks from Friday to Saturday at Sunnylands, a 200-acre (81-hectare) Annenberg estate in Rancho Mirage, California, the first face-to-face meeting between them since the two countries completed their latest leadership transitions.