The 194-party conference agreed to start negotiations on a new accord that would ensure that countries will be legally bound to carry out any pledges they make. It would take effect by 2020 at the latest.
The deal doesn't explicitly compel any country to take on emissions targets, although most emerging economies have volunteered to curb the growth of their emissions.
Currently, only industrial countries have legally binding emissions targets under the 1997 Kyoto Protocol. Those commitments expire next year, but they will be extended for at least another five years under the accord adopted Sunday