Reuters: U.S. Secretary of State John Kerry made an impassioned plea on Thursday for all nations to work for an ambitious U.N. deal next year to fight climate change, saying time was running out to reverse a course "leading to tragedy". He also took aim at domestic U.S. critics of President Barack Obama who question whether climate change is mainly man-made. Kerry said scientific findings were overwhelming and "screaming at us, warning us". "Every nation, every nation has a responsibility to do its part,"...