New York Times: Stunned by having been sidelined in the endgame of the Copenhagen world climate summit meeting, the European Union is debating how to regain influence in the fight against global warming. Should the E.U., the world`s largest trading bloc and economic area, respond to the policy setback and the diplomatic humiliation of the bare-minimum Copenhagen accord by playing Mr. Nice, Mr. Nasty, Mr. Persistent or Mr. Pragmatic? The first two options — setting a more ambitious example to …