President Barack Obama told world leaders Friday that it was time to come together on a climate change agreement, calling out stubborn positions that have stood in the way of progress, namely between rich and poorer countries.

FROM COPENHAGEN: What world leaders have been calling "unthinkable" all week -- leaving Copenhagen without a comprehensive draft economic for reducing greenhouse gas emissions -- is suddenly thinkable. There are many big agenda items remaining, and the parties…

Tension between rich and poor countries hovered over climate negotiations in Copenhagen Wednesday, as developing nations fumed over the leak of a climate document drafted by Denmark. The 13-page document, known as the Danish text, was drawn up outside…