More than 150 world leaders, along with negotiators from 196 countries, have descended on Paris for a United Nations climate conference with the goal of forging a new global treaty to require deep carbon emission reductions and to help poor countries that can't afford to cope with the effects of global warming.
The treaty is meant to keep global temperatures from rising more than two degrees Centigrade (3.6 degrees Fahrenheit) over what they were in preindustrial times.
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