China's influence grows in an ocean considered strategically vital by rival India.
Air quality suffers in provinces beyond the capital region, according to Greenpeace.
Doubts surround claims of an economic speedup in 2017.
Heavy reliance on natural gas imports is seen as a security risk.
The "frenzy" of investment in the US is over, expert says.
The financial risk rises as economic growth slows.
Driven in part by a growing domestic demand for fish, China’s fishing boats now range thousands of miles from home.