Donald Trump says Hong Kong can "go to hell", but what further weapons does the US president have in his arsenal? Political economy editors Zhou Xin and John Carter unpack the reality, and look at two potential crises for China: huge levels of bad loans in a struggling bank sector and food security, with Xi Jinping calling for an end to food waste. Finbarr Bermingham chats with reporters Jacob Fromer and Cissy Zhou about the SCMP scoop revealing US giant John Deere's huge exports of cotton…