Divisions that have plagued negotations over a global agreement to limit climate change prompt French Foreign Minister Laurent Fabius to declare a one-day extension to the Paris summit.
"We still need a Paris agreement," Obama said. "So my main focus is making sure that the United States is a leader in bringing a successful agreement home."
The technical talks repeated little of Monday's grand language. Countries restated their negotiating positions with few hints of likely compromise.
Erdogan also renewed a call to Russian President Vladimir Putin for a face-to-face meeting in Paris on the sidelines of the Global Climate Summit on Monday, saying it would be an opportunity to...