The other day, I scanned through the friends’ “Moment” on the phone app WeChat (Chinese equivalent to WhatsApp), a couple of photos caught my eyes. My friend titled them with “G20 Sky”. I thought they were shot somewhere in Europe. Naah, it was Shanghai. The photos show a line of beautiful houses with a lake in the front, more important, the sky on those photos is clearly very blue, only a few patches of clouds scattered.