A former top Chinese Communist Party aide sounds the alarm over the disappearance late last week of a veteran Beijing political journalist.
Advocates see benefits for climate change.
New leaders blame economic policies of the past.
The Ukraine crisis overshadows U.S. President Barack Obama's upcoming Asia trip.
Doubts remain over environmental effects.
Veteran Chinese dissident Wei Jingsheng says the outlook is bleak for peaceful change in China.
Sanctions threat may push Moscow to ease price demand.