NYT: "The Great Climate Wall of China," an exhibit assembled by Greenpeace for display at talks this week in Tianjin. A major climate conference is to open in late November in Cancún, Mexico. In an article in Friday`s paper, Elisabeth Rosenthal and I describe the bad mood and poor prospects pervading the run-up to the next big United Nations climate change conference, which opens at the end of November in Cancún, Mexico. Delegates and observers say that little progress has been made …