Peru climate change talks slowed by clashes of rich and poor nations

International climate talks in Lima, Peru, are entering their final week, with few hints of whether a newfound optimism that marked the start of negotiations will ultimately translate into an agreement that would rein in climate change.
Convened by the United Nations, the talks aim to craft the framework for an international accord to curtail heat-trapping emissions and adapt to changes already occurring on the planet. The final agreement is due to be signed in Paris next December.