Agence France-Presse: The world community has rallied around the goal of limiting global warming to two degrees Celsius (3.6 degrees Fahrenheit), but how to get there is becoming a headache.
One of the many knots to untangle at UN climate talks is whether to set a trajectory for reaching 2 C -- and if so, how.
Some countries say the 2 C goal itself is too vague, and needs to be buttressed by a long-term ceiling for greenhouse gas emissions.
"It would be clearer and more concrete than 2 C. But it's a tough issue,"...