Associated Press: President Barack Obama said Sunday that American leadership was helping make gains in the global fight against climate change, as he tried to reassure world leaders assembling for a historic conference in Paris that the U.S. can deliver on its commitments. Obama was joining more than 150 leaders in Paris for the opening days of a two-week U.N. conference where countries are trying to negotiate an agreement aimed at avoiding a disastrous increase in global temperatures. What makes this gathering...