Tanzanian authorities charged hundreds of people with treason over demonstrations around disputed polls last month, in a major escalation of political tension as the country reels from violence in which an unknown number of people were killed. In addition to dozens criminally charged a day earlier in Dar es Salaam, dozens more face similar treason charges elsewhere in the East African country according to numerous charge sheets that became publicly available Saturday. Police also issued arrest warrants for some of the top opposition officials who had not yet been jailed. They include Brenda Rupia, communications director for the Chadema opposition group,...

 Officials from countries most vulnerable to global warming offered searing dispatches of life on the front line of a warming planet Friday, as world leaders gathered on the edge of the Amazon rainforest for the annual United Nations climate talks. Ahead of Monday’s official kickoff, officials have sought to build support for initiatives to protect forests and to streamline carbon markets, which seek to reduce the emissions that drive warming. But the meetings also took time to hear impassioned testimony about the harms climate change is dealing around the world. Haitian diplomat Smith Augustin, whose country was pummeled by Hurricane Melissa, appealed to wealthier...