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One of China's richest men, Guo Guangchang, has been detained by police in Shanghai. His company, Fosun International, confirmed on Friday that he was "assisting authorities with an investigation". He had been missing, believed detained, for several hours, and trading in his listed companies on the Hong Kong stock exchange was halted. We hear from Jonathan Fenby, a former editor of the South China Morning Post.

The Chinese web giant Alibaba says it's agreed to buy Hong Kong's leading English-language paper, the South China Morning Post. The former has rejected fears that the Post would lose its editorial independence after the takeover.

As delegates at the COP21 Climate Summit in Paris close in on a long awaited agreement to limit carbon emissions we talk to Matthew Billson, Director of Energy2050 at Sheffield University, who is in the French capital to talk about carbon capture. Does he share the optimism of the French Foreign Minister, Laurent Fabius, who says conditions have never been as favourable for an agreement?

Plus, the outgoing US Secretary of Education tells our sister station, Marketplace, that he's left some unfinished business over college performance. And if you thought it was just Janis Joplin's friends who drove Porsches, think again - she drove one too, and it sold at auction for $1.8m

We're joined throughout the programme by Rohan Workman, Director of the Melbourne Accelerator Program at the University of Melbourne.

(Picture: Chinese billionaire Guo Guangchang. Copyright: Reuters)