Washington Post: House Speaker Nancy Pelosi, who unfurled a banner in Tiananmen Square in 1991 in support of pro-democracy protesters, has never been shy about speaking her mind about human rights in China. But on Sunday, she arrived here to talk about a less sensitive topic: climate change. At a briefing in Washington just before leaving for her week-long trip, Pelosi declined to say whether she planned to discuss human rights with her hosts. Instead, she said the focus of her visit would be …